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    Startseite Universität Regensburg. Die Universität Regensburg (UR) ist eine in Regensburg angesiedelte bayerische Volluniversität mit rund eingeschriebenen Studierenden im. Startseite · Gastronomie · Speiseplan · Uni Regensburg; Mensa. Montag ​ Dienstag Mittwoch Donnerstag Die Universität Regensburg bekommt ARM-Supercomputer. QPACE4 ist das vierte Projekt im Rahmen des SFB/TRR der Deutschen Forschungsgesellschaft . Ab Montag, 3. August , öffnet die kontaktfreie Ausleihe der Universitätsbibliothek Regensburg für externe Benutzer:innen. Benutzer:innen, die nicht der.

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    Ab Montag, 3. August , öffnet die kontaktfreie Ausleihe der Universitätsbibliothek Regensburg für externe Benutzer:innen. Benutzer:innen, die nicht der. Startseite · Gastronomie · Speiseplan · Uni Regensburg; Mensa. Montag ​ Dienstag Mittwoch Donnerstag Startseite Universität Regensburg. Als Ergänzung zum klassichen Jurastudium bietet die Uni Regensburg ein ostwissenschaftliches Begleitstudium Jackyll And Hyde ein Zertifikatsstudium "Osteuropäisches Recht". MärzHauptartikel auf S. Rahmenbedingungen An der rechtswissenschaftlichen Fakultät sind rund 2. Die Campus-Atmosphäre und kurze Wege kommen einem zügigen Studium entgegen. November der Lehrbetrieb beginnen konnte. Zu Semesterbeginn sind die Hannover Stuttgart Tipp zwar knapp, aber in der Regel ist es kein Problem, ein Zimmer oder eine kleine Wohnung zu Argentinien Wm Aus. Die gegründete Philosophisch-theologische Hochschule Regensburgzuvor bischöfliches Lyzeumwurde Teil der Regensburger Universität und bildete den Grundstock für den Aufbau der Theologischen Fakultät. Uni Rgbg

    Bernhard Dick. Uwe Kensy Dr. Roger-Jan Kutta. Flash Photolysis Studies on Photocatalytic Systems. Light can initiate chemical reactions in molecules.

    These reactions often follow a path different from thermal reactions, and can yield different products. Photons of visible or UV light carry enough energy to induce reactions that are endothermic or have to overcome a large barrier.

    The sun provides visible and UV light as a environment friendly and renewable energy source. Photoreactions can employ this energy not only as a storage for chemical energy, but also for chemical synthesis of compounds that are otherwise difficult to obtain.

    In normal photochemical reactions the reactant is also the chromophore, i. In a photocatalytic reaction, the functions of reactant and chromophore are separated see scheme below : The chromophore CH is excited by a photon and perfoms a first reaction step, e.

    Then the oxidized S undergoes the desired reaction. Finally, the initial state of the chromophore is reestablished by a thermal reaction with a second reactant R.

    In this reaction sequence the chromophore acts like a catalyst, and the photon is consumed like a chemical reagent. This undergoes electron transfer with a substrate molecule S.

    The oxidized substrate radical reacts thermally to the desired product P. The photocatalyst is thermally reoxidized by compound R.

    In the DFG Graduiertenkolleg Research Training Group GRK several research teams from organic, inorganic, and physical chemistry cooperate in the design and understanding of new photochemical systems.

    Our part in this is the study of the reaction mechanisms. We do this by transient absorption measurements following a short laser flash.

    In this way we follow the concentration time profiles of the reaction intermediates in the time range from 50 ns to 10 ms.

    We use a special and unique experimental setup built around a streak camera see below. This enables us to measure simultaneously the concentration time profiles kinetics and the spectra of the intermediates.

    Method: Transient absorption spectroscopy with a streak camera. The transient spectral data form a matrix A whose columns represent wavelengths and the rows represent time.

    Simple pump-probe experiments measure a single data point of the matrix A for each excitation cycle. The efficiency can be improved by measuring a complete time profile for each excitation cycle at one fixed wavelength, which corresponds to the measurement of a column of the matrix A.

    In order to obtain the full matrix A this measurement must be repeated at different wavelengths, keeping all other parameters of the apparatus constant.

    In all three compounds the dissociation occurs on a purely repulsive potential energy surface and on a time scale of a few femtoseconds.

    The same apparatus as for VMI is used. However, the ionization laser is tuned over all REMPI resonances of NO, and for each ion that hits the detector the position and the wavelength are recorded.

    The figure below shows a histogram of the ion counts as a function of wavelength horizontal axis and distance from the center vertical axis of the detector.

    Blue and green colors indicates low ion count, yellow and red colors corresponds to large counts.

    The picture consist of many stripes that are narrow along the wavelength axis and extend along the R-axis.

    A simultaneous fit to these data yields, for each quantum state, the velocity distribution, but also the population in this particular fragment channel.

    VMI: Velocity Map Imaging Photodissociation with a linearly polarized laser produces a velocity distribution of the fragments which is rotationally symmetric around the polarization direction.

    These ions are accelerated towards a two-dimensional detector MCP, see figure below. The vector from the center of the MCP to the position of ion impact is proportional to the in-plane component of the fragment velocity.

    The "ion image" is thus the projection of the velocity distribution onto a plane. The original three-dimensional velocity distribution can be reconstructed from the ion image by Abel inversion, or a fit of a model function.

    References: Kessler, A. Letters , , S1 Lb transition of 1,6-methano[10]annulene cooled in a supersonic jet, Phys. The UV-photodissociation of jet-cooled nitrosobenzene studied by fluorescence excitation spectroscopy of the NO fragment.

    Seiler, R. Alignment and velocity distribution of the NO fragments from the UV photo dissociation of jet-cooled nitrosobenzene studied by LIF and Doppler profile measurements.

    Obernhuber, Th. Schmaunz, A. Wenge, A.

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    Method: Transient absorption spectroscopy with a streak camera. The transient spectral data form a matrix A whose columns represent wavelengths and the rows represent time.

    Simple pump-probe experiments measure a single data point of the matrix A for each excitation cycle.

    The efficiency can be improved by measuring a complete time profile for each excitation cycle at one fixed wavelength, which corresponds to the measurement of a column of the matrix A.

    In order to obtain the full matrix A this measurement must be repeated at different wavelengths, keeping all other parameters of the apparatus constant.

    Alternatively, the whole transient absorption spectrum can be measured for fixed delay times with a short white light pulse, a monochromator, and an optical multichannel detector.

    This corresponds to the measurement of a row of the matrix A. The time needed for the determination of the complete matrix A will be similar to that for the column-wise measurements.

    We measure the complete data matrix A for each excitation cycle by a double multiplex method, using the combination of a continuous white probe light, a monochromator, and a streak camera.

    This results in a multiplex factor of more than , i. The pulse duration is typically 8 ns, and the energy typi-cally 10 mJ.

    The probe light is generated by a pulsed xenon flash lamp which produces a white light pulse with very flat intensity profile of ca.

    The lenses used in the original setup for the probe light path were replaced by toroidal mirrors. This makes the light path achromatic.

    An additional aperture and shutter in the probe light path re-duces the white light falling on the sample outside of the time window of the measure-ment.

    After passing through the sample the probe light is dispersed by a spectrograph and then temporally analyzed by the streak camera.

    The latter consists of two parts: the streak tube which produces an image on a phosphor screen, and a CCD camera which digitizes this image.

    In this domain, the photoactive cysteine C57 of the wild type is replaced by glycine. This introduces a "short-cut" into the photocycle which now proceeds from the triplet state of the flavin back to the ground state with a time constant of ca.

    The left side of the figure shows a false color representation of the two-dimensional spectral data. The fluorescence of flavin is clearly visible as the narrow blue horizontal stripe.

    The bleaching of the flavin ground state appears as a green vertical stripe centered at nm. Red colored stripes on both sides indicate transient absorption by the triplet state.

    A global fit to these data sets reveals two lifetime components. One is short with fitted decay times between 40 - 60 ns.

    The corresponding spectrum, shown in right part of the figure, is negative throughout the whole wavelength range with peaks at and nm.

    It is assigned to the fluorescence. It is due to the decay of the thiplet state peak at nm back to the ground state negative peak at nm.

    Nicole Berner. Bernhard Dick. Former Group Members:. Roger-Jan Kutta Dr. Andreas Schmaunz Dipl. Andreas Wenge Dr. Angela Kessler Dr.

    Thorsten Obernhuber Dr. Reinhold Seiler Dr. Robert Aures. Photodissociation dynamics of nitroso compounds Since NO is a stable radical, the X-N bond in nitroso compounds X-NO is usually weak and can be broken by thermal or photochemical excitation.

    After excitation to the second absorption band of NNPy dissociation into two different electronic states of the NPy radical has been observed.

    In all three compounds the dissociation occurs on a purely repulsive potential energy surface and on a time scale of a few femtoseconds.

    The same apparatus as for VMI is used. However, the ionization laser is tuned over all REMPI resonances of NO, and for each ion that hits the detector the position and the wavelength are recorded.

    The figure below shows a histogram of the ion counts as a function of wavelength horizontal axis and distance from the center vertical axis of the detector.

    Blue and green colors indicates low ion count, yellow and red colors corresponds to large counts. The picture consist of many stripes that are narrow along the wavelength axis and extend along the R-axis.

    A simultaneous fit to these data yields, for each quantum state, the velocity distribution, but also the population in this particular fragment channel.

    VMI: Velocity Map Imaging Photodissociation with a linearly polarized laser produces a velocity distribution of the fragments which is rotationally symmetric around the polarization direction.

    These ions are accelerated towards a two-dimensional detector MCP, see figure below.

    The oxidized substrate Therapierbar reacts thermally to the desired product P. The transient spectral data form a matrix A whose columns represent wavelengths and the rows represent time. VMI: Velocity Map Imaging Photodissociation with Uni Rgbg Online Casino Merkur Paypal polarized laser produces a velocity distribution of the fragments which is rotationally symmetric around the polarization direction. Thorsten Obernhuber Dr. In order to obtain the full matrix A this measurement must be repeated at different wavelengths, keeping all other parameters of the apparatus constant. In normal photochemical reactions the reactant is also the chromophore, i. In this reaction sequence the chromophore acts like a catalyst, and the photon is consumed like a chemical reagent. References: Kessler, A. In this reaction sequence the chromophore acts like a catalyst, and the photon is consumed like a chemical reagent. The oxidized substrate radical reacts thermally to the desired product P. However, the ionization laser is tuned over all REMPI resonances of NO, and for each ion that hits the detector the Forum Grenze and the wavelength are recorded. Alignment and velocity distribution of the NO fragments from the UV photo dissociation of jet-cooled nitrosobenzene studied Was Ist Lightning LIF and Doppler profile measurements. FuГџball Olympische Spiele Aures.

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