The Experts below are selected from a list of 72 Experts worldwide ranked by ideXlab platform
M Kitajima - One of the best experts on this subject based on the ideXlab platform.
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violation of the franck condon Principle due to recoil effects in high energy molecular core level photoionization
Physical Review Letters, 2005Co-Authors: E Kukk, K Ueda, U Hergenhahn, X J Liu, G Prumper, H Yoshida, Y Tamenori, C Makochekanwa, T Tanaka, M KitajimaAbstract:Carbon 1s photoelectron spectra of methane are measured over a photon energy range between 480 eV and 1200 eV. Additional components appear between the individual symmetric stretching vibrational components and are attributed to the excitations of asymmetric stretching and bending vibrations due to recoil of the high-energy photoelectron emission. This recoil effect is the evidence for the violation of the Franck-Condon Principle which states that neither the positions nor the momenta of the nuclei change during the ionization event.
Paul M Mayer - One of the best experts on this subject based on the ideXlab platform.
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should a franck condon or a curve crossing picture be applied to ion target collisional activation a study of kev co2 he collisions by emission spectroscopy
Journal of the American Society for Mass Spectrometry, 2008Co-Authors: Clement Poon, Paul M MayerAbstract:Collision-induced photon emissions (CIE) were observed for keV CO 2 +· /He collisions from 190 to 1020 nm. The emissions were assigned to the Δν=0 band of the CO 2 +· B 2Σ u + → X 2Πg electronic transition and the Δν = +3, +2, +1, 0, −1, −2, −3 vibrational transition progression in the CO 2 +· A 2Πu → X 2Πg electronic transition. The other peaks arise from the emissions of excited O· fragment atoms and the target gas. The relative intensities of the CO 2 +· and O· emissions are independent of the ion translational energy above 3 keV, supporting the curve-crossing mechanism for collisional excitation. Investigation of the relative intensities within the A 2Πu → X 2Πg emission of CO 2 +· indicates that the vibrational distribution is well described by the Franck-Condon Principle at high collision energy, a consequence of short collision time but not necessarily an indication of vertical transitions. Below 3 keV ion translational energy, vibrational excitation in the A 2Πu electronic state was observed. The observation is consistent with the explanation that the reaction occurs at small impact parameters, in which short-range, repulsive interactions between the projectile and the target result in direct translational-vibrational excitation.
E Kukk - One of the best experts on this subject based on the ideXlab platform.
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violation of the franck condon Principle due to recoil effects in high energy molecular core level photoionization
Physical Review Letters, 2005Co-Authors: E Kukk, K Ueda, U Hergenhahn, X J Liu, G Prumper, H Yoshida, Y Tamenori, C Makochekanwa, T Tanaka, M KitajimaAbstract:Carbon 1s photoelectron spectra of methane are measured over a photon energy range between 480 eV and 1200 eV. Additional components appear between the individual symmetric stretching vibrational components and are attributed to the excitations of asymmetric stretching and bending vibrations due to recoil of the high-energy photoelectron emission. This recoil effect is the evidence for the violation of the Franck-Condon Principle which states that neither the positions nor the momenta of the nuclei change during the ionization event.
Clement Poon - One of the best experts on this subject based on the ideXlab platform.
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should a franck condon or a curve crossing picture be applied to ion target collisional activation a study of kev co2 he collisions by emission spectroscopy
Journal of the American Society for Mass Spectrometry, 2008Co-Authors: Clement Poon, Paul M MayerAbstract:Collision-induced photon emissions (CIE) were observed for keV CO 2 +· /He collisions from 190 to 1020 nm. The emissions were assigned to the Δν=0 band of the CO 2 +· B 2Σ u + → X 2Πg electronic transition and the Δν = +3, +2, +1, 0, −1, −2, −3 vibrational transition progression in the CO 2 +· A 2Πu → X 2Πg electronic transition. The other peaks arise from the emissions of excited O· fragment atoms and the target gas. The relative intensities of the CO 2 +· and O· emissions are independent of the ion translational energy above 3 keV, supporting the curve-crossing mechanism for collisional excitation. Investigation of the relative intensities within the A 2Πu → X 2Πg emission of CO 2 +· indicates that the vibrational distribution is well described by the Franck-Condon Principle at high collision energy, a consequence of short collision time but not necessarily an indication of vertical transitions. Below 3 keV ion translational energy, vibrational excitation in the A 2Πu electronic state was observed. The observation is consistent with the explanation that the reaction occurs at small impact parameters, in which short-range, repulsive interactions between the projectile and the target result in direct translational-vibrational excitation.
Michael Schmitt - One of the best experts on this subject based on the ideXlab platform.
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determination of the geometry change of 5 cyanoindole upon electronic excitation from a combined franck condon rotational constants fit
Physical Chemistry Chemical Physics, 2014Co-Authors: Benjamin Stuhlmann, Anne Grasle, Michael SchmittAbstract:The geometry change of 5-cyanoindole upon electronic excitation from the ground to the lowest excited singlet state has been determined from a combined fit of the rotational constant changes upon excitation and the vibronic intensities in various fluorescence emission spectra using the Franck–Condon Principle. The so determined geometry change is compared to the results of ab initio calculations and points to an excited state geometry, which is La-like in the nomenclature of Platt. A mode selective coupling of vibronic bands to higher-lying excited states is discussed on the basis of Herzberg–Teller contributions to the Frank–Condon intensities.
