dr Olaf Morawski (Instytut Fizyki PAN)

Photochemical Hydrogen Storage with Hexaazatrinaphthylene

Seminarium hybrydowe

Climate warming and instabilities of fossil fuels supply make hydrogen a very desired energy carrier of the future. However, although a huge effort was devoted to development of hydrogen generation and storage methods, the current hydrogen technologies have still significant drawbacks. In the seminar an alternative approach to hydrogen generation and storage will be presented, with Proton-Coupled Electron Transfer (PCET), a process ubiquitous in nature that underpins energy conversion in chemistry and biology, as an engine of energy conversion. It will be shown that using Hexaazatrinaphthylene (HATN) as the photocatalyst, hydrogen atom can be abstracted from an alcohol molecule and stored on HATN. In this photochemical process, the energy of the absorbed photon is converted into the chemical energy of photoproducts.

dr hab. Bartłomiej Witkowski, prof. IF PAN (Instytut Fizyki PAN)

Reorganization of the ON2.4 group - new research areas, technologies and oxide materials

Seminarium hybrydowe

The aim of the seminar will be a presentation of the new research areas, technologies and materials after the reorganization of the ON2.4 group as a result of the transfer of employees from the ON4 division. In particular, two technologies will be presented: Atomic Layer Deposition and the hydrothermal method, which are mainly used for the growth of oxide nanostructures, including ZnO, Al₂O₃, TiO₂, ZrO₂, HfO₂, CuO and various combinations thereof. Works focused on various types of applications will also be presented, such as electrodes based on ZnO nanostructures for photovoltaic cells, bio-functional oxide layers, nanopowders as medical markers (fluorescent for cancer diagnostics and therapy, magnetic resonance markers), CuO layers as electronic memories cells or ZnO nanorods as UV detectors.

prof. dr hab. Zbigniew Kisiel (Instytut Fizyki PAN)

Interstellar and laboratory urea, (NH2)2CO

Seminarium hybrydowe

The relevance of urea is wide ranging, both as a molecule involved in animal (also human) metabolism, and as being responsible for breaking the paradigm that organic molecules can only be synthesised biologically. It is, therefore, an interesting target in extraterrestrial searches for building blocks of life (as we know it). Following several attempts, urea was successfully detected in a broadband ALMA survey of Sagittarius B2 interstellar molecular cloud (A&A 2019, 628, A10). Investigation of the rotational spectrum of urea that was used for astrophysical detection is not convenient and dates back to 1975. Understanding of the lowest vibrational energy levels has also been particularly challenging even though many studies of the infrared spectrum have been published. The most comprehensive study of the rotational spectrum of urea was only completed recently (J. Mol. Spectrosc. 2022, 390, 111706). The pattern of low lying vibrational levels has been established unambiguously, posing a challenge to quantum chemistry computations. An overview of both laboratory and astrophysical studies will be presented.

prof. dr hab. Bolesław Kozankiewicz (Instytut Fizyki PAN)

Spectroscopy of Single Organic Dye Molecules. Electric field effect.

Seminarium hybrydowe

Zero-phonon absorption and fluorescence lines from single molecules can be tuned by applying an external electric field a phenomenon known as the Stark effect. The majority of single-molecule systems possess the center of symmetry and in this case we observe a quadratic frequency shift of the zero-phonon lines. A well-known example are dibenzoterrylene (DBT) molecules in an anthracene crystal. A linear Stark effect, visualized as the linear frequency shift of the lines following the electric field, is associated to a lack of centrosymmetry of the guest molecule in the host matrix, which creates the change of its electric dipole moment. DBT in 2,3-dibromonaphthalene crystal is the first successful demonstration of a strategy to use an asymmetric and polar host matrix to induce the large static dipole moments in otherwise centrosymmetric guest molecule. The Stark-shifts of the molecular electronic levels can be also induced optically by focusing an intense laser beam on the sample. A photoionization cascade is proposed in order to explain the creation of the local and stable electric field in a crystalline matrix.

prof. dr hab. Andrzej L. Sobolewski (Instytut Fizyki PAN)

Hund's Rule Violating Molecules as Precursors of New Optoelectronic Materials

Seminarium hybrydowe

Almost one century ago, Friedrich Hund formulated his famous multiplicity rule according to which the term with maximum multiplicity has the lowest energy for a given electron configuration. This rule provides the base for the Jablonski diagram which is commonly used for discussions of molecular spectroscopy and photophysics. No stable organic molecules which violate Hund's Rule for the S1 and T1 excited states were definitely known until three years ago, when the existence of such molecules was discovered with wavefunction-based ab initio calculations and was confirmed experimentally. Further theoretical investigations have shown that there exists a wide class of stable organic molecules in which the lowest excited singlet state lies below the lowest excited triplet state. In this presentation, the results of extensive computational explorations of novel classes of organic molecules exhibiting singlet-triplet inversion will be presented in order to provide understanding of the fundamental mechanisms which are responsible for the violation of Hund's rule and to determine the electronic and geometric factors that govern the phenomenon. Provided that such molecules with appreciable fluorescence rates can be synthetized, they will become the next (forth) generation of OLED materials.

dr hab. Jerzy Karpiuk (Instytut Fizyki PAN)

Photophysics of bichromophoric donor-acceptor spiranes. Regularities and peculiarities

Seminarium on-line

Brak.

dr Lucie Kolesníková (Grupo de Espectroscopia Molecular (GEM), Laboratorios de Espectroscopia y Bioespectroscopia, Unidad Asociada CSIC, Universidad de Valladolid, Spain and Laboratory of High-Resolution Molecular Spectroscopy, Department of Analytical Chemistry, University of Chemistry and Technology, Prague, Czech Republic)

Laser ablation of solid organic compounds: an alternative tool for the generation of molecules of astrophysical interest

Brak.

dr Michał Rode (Instytut Fizyki PAN)

Photophysics of the molecular photoswitch based on ESIPT phenomenon

Brak.

dr inż. Łukasz Kłosowski i dr Mariusz Piwiński (Laboratorium FAMO UMK w Toruniu)

Zderzenia w eksperymentach wiązkowych i w pułapkach jonowych

Zderzenia na poziomie atomowym stanowią najbardziej elementarne zjawiska, których poznanie decyduje o rozumieniu bardziej złożonych zjawisk zachodzących w gazach, w atmosferze, w plazmie, itd. Nasza grupa od wielu lat zajmuje się badaniami różnych zderzeń realizowanymi w różnych układach doświadczalnych obejmujących zarówno eksperymenty wiązkowe, jak i doświadczenia z zastosowaniem pułapek jonowych. W wystąpieniu przedstawione zostaną prowadzone w Toruniu (Instytut Fizyki i Krajowe Laboratorium FAMO) badania nad zderzeniowymi wzbudzeniami atomów [1], jonizacją atomów [2], zderzeniami sprężystymi elektron-jon [3], zderzeniami jon-atom z przekazem ładunku, jonizacją cząsteczek, itd. Zostaną przedstawione wyniki badań tzw. rezonansów nieliniowych obserwowanych w pułapce Paula [4], które mogą znaleźć zastosowanie w spektroskopii masowej produktów zderzeń. Dodatkowo omówiony zostanie eksperyment dotyczący chłodzenia stanów rotacyjnych spułapkowanych jonów molekularnych w zderzeniach z atomami gazu buforowego [5] przeprowadzony we współpracy z Uniwersytetem w Aarhus w Danii.
1. M. Piwiński, Ł. Kłosowski, S. Chwirot, D. Fursa, I. Bray, T. Das, R. Srivastava, JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS 51, 2018, 085002
2. Ł. Kłosowski, M. Piwiński, S. Wójtewicz, D. Lisak, JOURNAL OF ELECTRON SPECTROSCOPY AND RELATED PHENOMENA, 228, 2018, 13-19
3. Ł. Kłosowski, M. Piwiński, PHYSICS OF PLASMAS, 25, 2018, 102114
4. Ł. Kłosowski, M. Piwiński, K. Pleskacz, S. Wójtewicz, D. Lisak, JOURNAL OF MASS SPECTROMETRY, 53, 2018, 541-547
5. A. Hansen, O. Versolato, Ł. Kłosowski, S. Kristensen, A. Gingell, M. Schwarz, A. Windberger, J. Ullrich, J. Crespo Lopez-Urrutia, M. Drewsen, NATURE, 508, 2014, 76-79

mgr Anna Luchowska (Instytut Fizyki PAN)

Reorientacja grupy SH (lub OH) jako wynik transportu energii wzbudzenia oscylacyjnego w cząsteczkach izolowanych w matrycach niskotemperaturowych

Brak.

prof. dr hab. Zbigniew Kisiel (Instytut Fizyki PAN)

THZ Molecular Spectroscopy (Review lecture based on the author's chapter in Encyclopedia of Modern Optics)

Improving techniques of access to THz frequencies ofelectromagnetic radiation have opened up this region for extensive studies of molecular spectra. This concerns, in particular, high resolution, broadband studies of rotational and rotation-vibration spectra of relatively light molecules, such as water and methanol. The objectives of such studies range from refinement of the quantum mechanical description of these very challenging molecular systems to applied environmental uses, especially in detection of molecules in interstellar space by the new powerful tools of radio astronomy.
Review lecture based on the author's chapter in Encyclopedia of ModernOptics Second Edition, Vol.1, 387-402, Elsevier, 2018.

Prof. Ryszard Jankowiak (Kansas State University, Manhattan, KS, USA)

Excitonic structure and dynamics in various photosynthetic antenna protein complexes: hole-burning and modeling studies

Low temperature (high-resolution) hole-burning (HB) spectroscopy and modeling studies of various optical spectra of photosynthetic complexes provide new insight into excited state electronic structure and dynamics. The following complexes will be briefly discussed: 1) The CsmA-bacteriochlorophyll α complex from C. tepidum. In this case, in contrast to literature data, an alternative structure is proposed for the baseplate; 2) The FMO antenna complex from . tepidum and its mutants. Using an experimentally determined shape for the spectral density for the lowest-energy state (J_ph(ω)), simulated optical spectra are obtained from structure-based calculations for the FMO trimer. For higher energy pigments, the effect of a broader J_ph(ω) shape with a different S factor and/or variable Γ_inh are also tested for comparison. I will demonstrate that in order to properly describe various low-temperature optical spectra, a downward uncorrelated excitation energy transfer (EET) between trimer subunits must to be taken into account. That is, after light induced coherences vanish within each monomer, uncorrelated EET between the lowest exciton levels of each monomer takes place due to static structural inhomogeneities in the trimer. The information gained provides new insight into disorder, excitonic structure, EET dynamics and mutation induced changes induced via site directed mutagenesis; and 3) The B800-850 LH2 antenna complex from Alc.vinosum, which exhibits an unusual spectral splitting of the B800 absorption band. Here, we propose that various protein conformations lead to either strong or weak hydrogen bonds between the protein and B800 pigments.

mgr Urszula Szczepaniak (Instytut Chemii Fizycznej PAN)

Łańcuchy węglowo-azotowe o znaczeniu astrochemicznym: spektroskopia i fotochemia

Pełen tekst streszczenia ( )

dr Mikołaj Pochylski (Wydział Fizyki UAM)

Spektroskopia Brillouina w badaniach materii miękkiej

Spektroskopia Brillouina wykorzystuje zjawisko nieelastycznego rozpraszania światła na termicznie (spontanicznie) indukowanych fluktuacjach gęstości, które propagują się w układzie w postaci fal akustycznych. Będąc metodą optyczną, technika ta umożliwia bezkontaktowy i bezinwazyjny pomiar mechanicznych właściwości materii skondensowanej. W trakcie seminarium wyjaśnione zostaną fizyczne podstawy zjawiska rozpraszania Brillouina, metody teoretyczne jego opisu oraz sposób pozyskania i interpretacji danych pomiarowych. Za ilustrację posłużą autorskie wyniki badań otrzymanych w kilku modelowych układach ciekłych oraz miękkich. Zaprezentowane zostaną również przykłady najnowszych zastosowań metody rozpraszania Brillouina wykraczające poza dziedzinę badań fizykochemicz-nych, a dotyczące zagadnień biomedycznych.

Pablo Pinacho (Department of Physical Chemistry and Inorganic Chemistry, University of Valladolid, Spain)

Formamide Microsolvation Studied by Supersonic Expansion Rotational Spectroscopy

Brak.

Prof. Anthony Legon (School of Chemistry, University of Bristol, UK)

Of microwaves, molecules and men

Microwave rotational spectroscopy has made a significant contribution to our understanding of molecules. This lecture will consist of a brief account of what I believe are some of the more striking contributions that microwave spectroscopy has made to Chemistry and Physics. The selection is entirely personal and others would make different choices. It begins with the first observed microwave spectrum (that of ammonia at very low resolution) in 1934. Then selected contributions of Charles Townes, E. Bright Wilson, Willis Flygare, James Millen, William Klemperer, Harry Kroto, Kenneth Pitzer, William Gwinn and Alan Carrington will be discussed, some in more detail than others.

dr Joanna Jankowska (Instytut Fizyki PAN)

Oddziaływanie komponentów organicznych i nieorganicznych w hybrydowych perowskitach - znaczenie dla procesu rekombinacji fotoindukowanych nośników ładunku

Streszczenie

Brak.

mgr Joanna Jankowska (MISDoMP Uniwersytet Warszawski)

Fotoprzełączanie zasad Schiffa - wpływ efektu podstawnikowego na fotoindukowane wewnątrzcząsteczkowe przeniesienie protonu

Streszczenie

Brak.

dr hab. Jerzy Karpiuk (Instytut Fizyki PAN)

Przejścia międzysystemowe w parach jonorodnikowych. Wpływ struktury na dynamikę spinów

Streszczenie

Brak.

mgr Anna Hałasa (Instytut Fizyki PAN)

Przemiany konformacyjne zachodzace w kwasie glikolowym indukowane swiatlem NIR generowanym przez przestrajalny laser diodowy

Streszczenie

Brak.

prof. dr hab. Daniel T. Gryko (Instytut Chemii Organicznej PAN, Wydział Chemii Politechniki Warszawskiej)

Liniowe i nieliniowe właściwości optyczne nowych barwników funkcjonalnych

Streszczenie

Brak.

mgr Magda Białkowska (Instytut Fizyki PAN)

Badania polimeryzacji rodnikowej modyfikowanej trwa?ymi rodnikami nitroksylowymi.
(Sprawozdanie po rocznym pobycie na Katolickim Uniwersytecie w Leuven)

Streszczenie

Brak.

Prof. Yi-Jehng Kuan (Department of Earth Sciences, National Taiwan Normal University)

Interstellar Pyrimidine.

Streszczenie

Hot molecular cores of giant molecular clouds have been observed tocontain many organic molecules with some of them known to be prebioticallyimportant and fundamental to biochemistry. A key interstellar molecule forastrobiology would be pyrimidine (c-C4H4N2), the unsubstituted ringanalogue for three of the DNA and RNA bases: thymine, cytosine and uracil.(Sub)millimeter spectral searches of the nucleic acid building-blockpyrimidine using the James Clerk Maxwell Telescope (JCMT) and theSubmillimeter Array (SMA) were thus conducted toward hot molecular cores,in particular, Orion KL, which is known to contain the precursor moleculesof this heterocyclic ring molecule. I will discuss our preliminary resultand its implication in the talk. Using this opportunity, I will alsoreview the past and current development of (sub)millimeter radio astronomybriefly.

Prof. Krzysztof Kuczera (Departments of Chemistry and Molecular Biosciences The University of Kansas, Lawrence)

Biomolecular dynamics from FRET experiments and computer simulations.

Streszczenie

Brak.

Amanda Ross (Laboratoire de Spectrométrie Ionique et Moléculaire, UMR5579 CNRS & Université Lyon 1, France)

Background work for interpretation of sunspot spectra - one of the motivations for laboratory spectroscopy of very small molecules.

Streszczenie

Spectroscopy - in whatever form - is undoubtedly our best available probe for distant objects for which direct investigation is impossible. Molecular spectra have been identified in cool stellar objects, but cool, in this context, implies temperatures around 3000 Kelvin. Transition metal hydrides are possible probes of magnetic field in sun (or star) spots. Laboratory spectra are required to supply reliable parameters for spectropolarimetric analysis of data taken at telescopes. We need to observe rotationally and vibrationally excited levels that are not thermally populated in laboratory conditions, and we need to resolve the MJ components of individual spectral lines.
My talk will describe some laboratory Zeeman measurements in the electronic spectra of NiH and FeH, taken in laser excitation and/or in resolved (FT) fluorescence. I will illustrate the talk with comparisons of FeH transitions recorded in sunspot spectra.

dr hab. Leszek Łapinski (Instytut Fizyki PAN)

Fotoizomeryzacje izolowanych cząsteczek cytozyny i 1-metylocytozyny.

Streszczenie

Brak.

prof. dr hab. Zbigniew Kisiel (Instytut Fizyki PAN)

Heksamer, heptamer i nonamer wody: obserwacja widm rotacyjnych i precyzyjne struktury eksperymentalne.

Streszczenie

Brak.

mgr Magdalena Pagacz-Kostrzewa (Wydział Chemii Uniwersytetu Wrocławskiego)

Konformacje i fotochemia pochodnych azoli.
Badania spektroskopowe i teoretyczne.

Streszczenie

Brak.

Prof. Ryszard Jankowiak (Department of Chemistry, Kansas State University, Manhattan, USA)

Wybrane zagadnienia z fotosyntezy.

Streszczenie

Brak.

mgr Marcin Gronowski (Instytut Chemii Fizycznej PAN)

Teoria i eksperyment w badaniach spektroskopii wybranych nitryli o znaczeniu astrochemicznym oraz cząsteczek pokrewnych.

Streszczenie

Brak.

prof. Michel Orrit (Leiden Institute of Physics, Leiden University)

Single Molecules and Nanoparticles as Probes for Structure and Dynamics

Streszczenie

Brak.

mgr Joanna Grzegorzek (Wydział Chemii Uniwersytetu Wrocławskiego)

Fotoindukowana izomeria konformacyjna i tautomeria aromatycznych orto-hydroksylowych oksymów i zasad Schiffa.

Streszczenie

Brak.

dr Marek Graff (Wydział Chemii UW)

Zastosowanie spektroskopii powierzchniowo wzmocnionego rozproszenia ramanowskiego do rozpoznawania molekularnego (alfa)-aminokwasów na powierzchni srebra.

Streszczenie

Brak.

Prof. Krzysztof Kuczera (Department of Chemistry, University of Kansas, Lawrence, USA)

Peptide computer simulations: microscopic explanations of spectroscopic effects.

Streszczenie

Brak.

dr Margaret Mandziuk (Manhattan College, School of Science, New York)

Enhanced stacking interactions between nucleic acid base pairs upon hydrogenation.

Streszczenie

Brak.

prof. Krzysztof Kuczera (Departments of Chemistry and Molecular Biosciences University of Kansas)

Computer simulations of peptides: spectroscopic and conformational studies.

Streszczenie

Brak.

mgr Dariusz Wiącek (Instytut Fizyki PAN)

Cząsteczka terylenu jako sonda jej nanootoczenia.

Streszczenie

Brak.

Prof. Dr. Wolfgang Domcke (Technische Universität München, Garching)

Femtosecond Dynamics at Conical Intersections of Polyatomic Molecules.

Streszczenie

Brak.

dr hab. Borys Kierdaszuk (Zakład Biofizyki Instytutu Fizyki Doświadczalnej UW)

Sondowanie struktury liganda w kompleksach enyzm-ligand za pomocą spektroskopii emisyjne.

Streszczenie

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mgr Artur Makarewicz (Instytut Fizyki PAN)

Formy N-tlenków 2-alkiloamino-6-metylo-4-nitropirydyny w stanie wzbudzonym elektronowo.

Streszczenie

Brak.

mgr Anna Gerega (Instytut Fizyki PAN)

Wpływ rozszerzenia układu π-elektronowego na równowagi tautomeryczne w cząsteczkach heterocyklicznych.

Streszczenie

Brak.

dr hab. Leszek Łapiński (Instytut Fizyki PAN)

Procesy fotoindukowanego wewnątrzcząsteczkowego przeniesienia protonu w prostych i heterocyklicznych amidach i tioamidach.

Streszczenie

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prof. dr hab. Tadeusz Marek Krygowski (Pracownia Krystalochemii Wydziału Chemii UW)

Dalekozasiegowe konsekwencje wiazania wodorowego.

Streszczenie

Brak.

Prof. Jean-Claude Guillemin (Ecole Nationale de Chimie de Rennes, Francja)

Synthesis and spectroscopy of unsaturated nitriles, interstellar components or prebiotic key-compounds.

Streszczenie

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mgr Orest Doroshi (Instytut Fizyki PAN)

Analiza szerokopasmowego widma rotacyjnego cząsteczki S(CN)₂.

Streszczenie

Brak

Dr. Charles Lee (Air Force Office of Scientific Research, Arlington, Virginia, USA)

An overview of Organic Materials Research carried out at AFOSR.

Streszczenie

The goal of this research area is to gain a better understanding of the influence of chemical structures and processing conditions on the properties and behaviors of polymeric and organic materials. Current interests include photonic polymers, polymers with interesting electronic properties, liquid crystals, bio-inspired materials and nanostructures.
In the area of photonic polymers, research emphases are placed on electro-optic and photorefractive polymers. Organic molecules with large multiphoton absorption cross sections are also of interest. It is desirable to increase the electro-optical coefficients of organic and polymeric materials with appropriate levels of thermal and temporal stability. Space operation issues of these polymers are also of interests. Control of speed and wavelength sensitivity in organic photorefractive polymers is currently supported. Examples of electronic properties of interest include conductivity, electrochromaticism, electroluminescence, electro-pumped lasing and superconductivity. In the area of structural properties, polymers with high thermomechanical properties are desirable. Approaches based on biological systems to achieve materials properties that are difficult to achieve through conventional means are of interest. Current supports in nanostructures include controlling optical, electronic and mechanical properties and fabrication of submicron scale structures.
Organic based materials, including inorganic hybrids, with controlled magnetic permeability and dielectric permittivity are also of interest. Of great interest are multifunctional materials with non-trivial, low-loss permittivity and permeability at frequencies greater than 100 MHz, especially those functioning at greater than 1 GHz. Material concepts that can improve on the above-mentioned optical, electronic, and mechanical properties of polymers are sought. These concepts include, but are not limited to, organic and polymeric materials, polymer blends, liquid crystals, and nanostructures.

mgr Orest Doroshi (Instytut Fizyki PAN)

Spektroskopia rotacyjna aldehydu salicylowego: struktura, moment dipolowy i wewnętrzne wiązanie wodorowe.

Streszczenie

Brak

doc. dr hab. Andrzej Sobolewski (Instytut Fizyki PAN)

Badania teoretyczne mechanizmów dezaktywacji bezpromienistej w cząsteczkach filtrujących promieniowanie UV.

Streszczenie

Brak

prof. dr hab. Zbigniew Kisiel (Instytut Fizyki PAN)

Konformacje n-propanolu z analizy widma rotacyjnego.

Streszczenie

Brak

Dr Igor Reva (Department of Chemistry, University of Coimbra, Portugalia)

Matrix isolation studies of conformational isomerism in non-rigid molecules with 1, 2, 3, and 4 degrees of freedom.

Streszczenie

Brak

Prof. Krzysztof Kuczera (Department of Chemistry and Department of Molecular Biosciences, The University of Kansas)

Domain motions in the enzyme S-adenosylhomocyteine hydrolase: mutagenesis, fluorescence and modeling.

Streszczenie

Ten dość duży enzym - tetramer 4x432 aminokwasy - krystalizuje w formieotwartej pod nieobecność substratu, i w formie zamkniętej w kompleksach zinhibitorami.Przedstawiam wyniki współpracy z biochemikami i spektroskopistami, wwyniku której wyprodukowaliśmy mutanty w regionie "zawiasu", zmierzyliokres ruchu domen oraz wysymulowali te ruchy metodami analizy drgańnormalnych i dynamiki molekularnej.

mgr Serhiy Perun (Instytut Fizyki PAN)

Badania ab initio fotofizyki cząsteczek adeniny (A) i tyminy (T) oraz kompleksu A-T.

Streszczenie

Brak

mgr Jakub Włodarczyk (Zakład Biofizyki, Instytut Fizyki Doświadczalnej UW)

Nieeksponencjalna kinetyka zaników fluorescencji w białkach.

Streszczenie

Brak

mgr Artem Khvorostov (Instytut Fizyki PAN)

Fotoindukowane procesy przeniesienia protonu obserwowane w pochodnych tiouracylu.

Streszczenie

Brak

Prof. Dr. Heinrich Maeder (Universitaet Kiel, Institut fuer Physikalische Chemie, Niemcy)

30 Years of Fourier Transform Microwave Spectroscopy.
How it started, what it has achieved, and where it might go to.

Streszczenie

With development of microwave spectroscopy after World War II, this technique was successfully applied in its early decades to study the rotational spectra of stable molecules in gas phase with observation of absorption signals. About 30 years ago, the alternative technique of Fourier Transform Microwave (FTMW) spectroscopy has been introduced. The FT technique is based on the observation of transient signals emitted from a coherently prepared sample of molecules and it holds some advantages with respect to absorption MW spectroscopy.

The principles of operation of FTMW spectroscopy will be shortly outlined and some remarks on the history of its development will be presented.

In its original versions, FTMW spectroscopy was applied to the study of static gases in waveguides (WG-FTMW spectroscopy). Besides single resonance experiments, these pulse techniques have been extended to double resonance methods which allow the recording of two-dimensional (2D) spectra. Examples for 1D- and 2D- FT experiments will be given.

Later on, FTMW spectroscopy was applied to molecular beams in MW resonators (MB-FTMW spectroscopy) which lead to further applications, such as the study of rotational spectra of weakly bound molecular complexes and unstable molecules. Examples for such studies from the Kiel group will be presented. Some selected study examples from other groups will also be given to demonstrate the high potential of FTMW spectroscopy which is a promising spectroscopic tool for future applications in rotational spectroscopy.

dr Igor Reva (University of Coimbra, Coimbra - Portugalia)

[1,5] sigmatropic hydrogen shift in alpha-pyrone and its substituted analogues. Matrix isolation FT-IR and theoretical study

Streszczenie

Brak

mgr Oleksandr Desyatnyk(IF PAN)

Wyznaczanie struktury i momentów dipolowych cząsteczek metodąspektroskopii rotacyjnej

Streszczenie

Brak

Dr Wolf Dietrich Geppert(Department of Molecular Physics Alba Nova University of Stockholm)

Dissociative recombination of astrophysical ions

Streszczenie

The CRYRING facility in the Manne Siegbahn Laboratory at Stockholm University allows the study of dissociative recombination reactions at collision energies ranging of those prevalent in the interstellar medium to the ones present in plasmas generated by combustion processes.
Reactive cross sections and branching ratios for the dissociative recombination (DR) reactions of the astrophysically important ions HN₂⁺, HCO⁺, HCS⁺, DOCO⁺, and SO₂⁺ have been determined, and in many cases surprising results have been obtained. Inclusion of the newly measured branching ratios into a standard model on dark interstellar clouds lead to an improvement of the predictions of such models, especially concerning the abundances of nitrogen compounds. The impact of these data on the chemistry of different astronomical environments like dark clouds, circumstellar envelopes and planetary ionospheres is discussed.