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A Campargue - One of the best experts on this subject based on the ideXlab platform.
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Predissociation and spectroscopy of the 3a2 0 0 0 state of 18o3 from crds spectra of the 3a2 0 0 0 x1a1 1 1 0 hot band near 7900 cm 1
Journal of Quantitative Spectroscopy & Radiative Transfer, 2012Co-Authors: D Mondelain, R Jost, S Kassi, Richard H Judge, Vladimir G Tyuterev, A CampargueAbstract:Abstract The spectroscopy and Predissociation of the 3A2(0 0 0) state of 18O3 are investigated from the analysis of the absorption spectrum of the 3A2(0 0 0)← X ˜ 1 A 1 ( 1 1 0 ) hot band recorded by high sensitivity cw-CRDS between 7600 and 7920 cm−1. The noise equivalent absorption of the recordings is on the order of 1×10−10 cm−1. Forty transitions could be rotationally assigned and their line positions were used to derive approximate spectroscopic parameters of the 3A2(0 0 0) upper state. Most of the transitions exhibit a clear broadening due to the Predissociation of the 3A2(0 0 0) upper state at 9573.61 cm−1. The width of the Lorentzian component (from 0.02 up to more than 0.5 cm−1) was retrieved for some of the assigned transitions. The variation of the corresponding Predissociation rates is due to the dependence of the spin–orbit coupling between the 3A2(0 0 0) level and high lying dissociative vibrational levels of the X ˜ 1 A 1 electronic ground state, with (i) the J and Ka rotational quantum numbers and (ii) the energy gap between the coupled pair of rotational levels. From the predicted energies of the X ˜ 1 A 1 vibrational states and their vibrational overlap with the 3A2(0 0 0) state, a few of these X ˜ 1 A 1 vibrational levels are identified as possibly responsible for the 3A2(0 0 0) Predissociation. The predissociative mechanism in 18O3 is compared to that taking place in 16O3.
D Mondelain - One of the best experts on this subject based on the ideXlab platform.
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Predissociation and spectroscopy of the 3a2 0 0 0 state of 18o3 from crds spectra of the 3a2 0 0 0 x1a1 1 1 0 hot band near 7900 cm 1
Journal of Quantitative Spectroscopy & Radiative Transfer, 2012Co-Authors: D Mondelain, R Jost, S Kassi, Richard H Judge, Vladimir G Tyuterev, A CampargueAbstract:Abstract The spectroscopy and Predissociation of the 3A2(0 0 0) state of 18O3 are investigated from the analysis of the absorption spectrum of the 3A2(0 0 0)← X ˜ 1 A 1 ( 1 1 0 ) hot band recorded by high sensitivity cw-CRDS between 7600 and 7920 cm−1. The noise equivalent absorption of the recordings is on the order of 1×10−10 cm−1. Forty transitions could be rotationally assigned and their line positions were used to derive approximate spectroscopic parameters of the 3A2(0 0 0) upper state. Most of the transitions exhibit a clear broadening due to the Predissociation of the 3A2(0 0 0) upper state at 9573.61 cm−1. The width of the Lorentzian component (from 0.02 up to more than 0.5 cm−1) was retrieved for some of the assigned transitions. The variation of the corresponding Predissociation rates is due to the dependence of the spin–orbit coupling between the 3A2(0 0 0) level and high lying dissociative vibrational levels of the X ˜ 1 A 1 electronic ground state, with (i) the J and Ka rotational quantum numbers and (ii) the energy gap between the coupled pair of rotational levels. From the predicted energies of the X ˜ 1 A 1 vibrational states and their vibrational overlap with the 3A2(0 0 0) state, a few of these X ˜ 1 A 1 vibrational levels are identified as possibly responsible for the 3A2(0 0 0) Predissociation. The predissociative mechanism in 18O3 is compared to that taking place in 16O3.
Kenneth C Janda - One of the best experts on this subject based on the ideXlab platform.
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competition between electronic and vibrational Predissociation dynamics of the hebr2 and nebr2 van der waals molecules
Journal of Chemical Physics, 2010Co-Authors: Molly A Taylor, Wytze E Van Der Veer, Kenneth C JandaAbstract:Direct measurements of the lifetimes of HeB79r2 and NeB79r2 B-state vibrational levels 10≤ν′≤20 have been performed using time-resolved optical pump-probe spectroscopy. The values do not obey the energy gap law for direct vibrational Predissociation. For both molecules, the dissociation rate for ν′=11 is much faster than for ν′=12, and the ν′=13 rate is also faster than is consistent with the energy gap law. We attribute this unexpected behavior to an electronic Predissociation channel. Based on Franck–Condon factors between the Br2 B-state vibrational wave functions and the possible Br–Br product wave functions, we surmise that either the Br2 Π3g(1g) or (2g) state is responsible for the electronic Predissociation. To our knowledge, this is the first time electronic Predissociation and direct Δν=−1 vibrational Predissociation have been observed to be in competition for a wide range of vibrational levels. As such, this problem deserves a detailed theoretical analysis.
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necl2 and arcl2 transition from direct vibrational Predissociation to intramolecular vibrational relaxation and electronic nonadiabatic effects
Journal of Physical Chemistry A, 2010Co-Authors: Kenneth C Janda, Craig R Bieler, Ramon Hernandezlamoneda, Octavio RonceroAbstract:Pump-probe results are reported for NeCl(2) excited to the Cl(2) B state, undergoing vibrational Predissociation, and then probed via E <-- B transitions. Intensities, lifetimes and product vibrational branching ratios are reported for 16 < or = v' < or = 19 Cl(2) stretching quanta. The intensity of the signal rapidly decreases above v' = 17. Detailed wave packet calculations of the vibrational Predissociation dynamics are performed to determine if the experimental results can be explained by the onset of IVR dynamics. The calculations and the experiment are in close accord for low vibrational levels. For higher levels, some, but not all, of the loss of experimental signal can be attributed to IVR. To test whether electronic relaxation dynamics are important for NeCl(2) and ArCl(2), excited state potential surfaces that incorporate spin orbit coupling effects are calculated. These surfaces are then used in a wave packet calculation that includes both vibrational Predissociation and electronic Predissociation dynamics. The results show that electronic Predissociation is important for ArCl(2) levels above v' = 12. For NeCl(2) the calculation suggests that the onset of electronic Predissociation should occur for levels as low as v' = 13 but may not contribute markedly to the observed loss of signal above v' = 17. Suggestions are made for further studies of this puzzling problem.
R Jost - One of the best experts on this subject based on the ideXlab platform.
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Predissociation and spectroscopy of the 3a2 0 0 0 state of 18o3 from crds spectra of the 3a2 0 0 0 x1a1 1 1 0 hot band near 7900 cm 1
Journal of Quantitative Spectroscopy & Radiative Transfer, 2012Co-Authors: D Mondelain, R Jost, S Kassi, Richard H Judge, Vladimir G Tyuterev, A CampargueAbstract:Abstract The spectroscopy and Predissociation of the 3A2(0 0 0) state of 18O3 are investigated from the analysis of the absorption spectrum of the 3A2(0 0 0)← X ˜ 1 A 1 ( 1 1 0 ) hot band recorded by high sensitivity cw-CRDS between 7600 and 7920 cm−1. The noise equivalent absorption of the recordings is on the order of 1×10−10 cm−1. Forty transitions could be rotationally assigned and their line positions were used to derive approximate spectroscopic parameters of the 3A2(0 0 0) upper state. Most of the transitions exhibit a clear broadening due to the Predissociation of the 3A2(0 0 0) upper state at 9573.61 cm−1. The width of the Lorentzian component (from 0.02 up to more than 0.5 cm−1) was retrieved for some of the assigned transitions. The variation of the corresponding Predissociation rates is due to the dependence of the spin–orbit coupling between the 3A2(0 0 0) level and high lying dissociative vibrational levels of the X ˜ 1 A 1 electronic ground state, with (i) the J and Ka rotational quantum numbers and (ii) the energy gap between the coupled pair of rotational levels. From the predicted energies of the X ˜ 1 A 1 vibrational states and their vibrational overlap with the 3A2(0 0 0) state, a few of these X ˜ 1 A 1 vibrational levels are identified as possibly responsible for the 3A2(0 0 0) Predissociation. The predissociative mechanism in 18O3 is compared to that taking place in 16O3.
S Kassi - One of the best experts on this subject based on the ideXlab platform.
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Predissociation and spectroscopy of the 3a2 0 0 0 state of 18o3 from crds spectra of the 3a2 0 0 0 x1a1 1 1 0 hot band near 7900 cm 1
Journal of Quantitative Spectroscopy & Radiative Transfer, 2012Co-Authors: D Mondelain, R Jost, S Kassi, Richard H Judge, Vladimir G Tyuterev, A CampargueAbstract:Abstract The spectroscopy and Predissociation of the 3A2(0 0 0) state of 18O3 are investigated from the analysis of the absorption spectrum of the 3A2(0 0 0)← X ˜ 1 A 1 ( 1 1 0 ) hot band recorded by high sensitivity cw-CRDS between 7600 and 7920 cm−1. The noise equivalent absorption of the recordings is on the order of 1×10−10 cm−1. Forty transitions could be rotationally assigned and their line positions were used to derive approximate spectroscopic parameters of the 3A2(0 0 0) upper state. Most of the transitions exhibit a clear broadening due to the Predissociation of the 3A2(0 0 0) upper state at 9573.61 cm−1. The width of the Lorentzian component (from 0.02 up to more than 0.5 cm−1) was retrieved for some of the assigned transitions. The variation of the corresponding Predissociation rates is due to the dependence of the spin–orbit coupling between the 3A2(0 0 0) level and high lying dissociative vibrational levels of the X ˜ 1 A 1 electronic ground state, with (i) the J and Ka rotational quantum numbers and (ii) the energy gap between the coupled pair of rotational levels. From the predicted energies of the X ˜ 1 A 1 vibrational states and their vibrational overlap with the 3A2(0 0 0) state, a few of these X ˜ 1 A 1 vibrational levels are identified as possibly responsible for the 3A2(0 0 0) Predissociation. The predissociative mechanism in 18O3 is compared to that taking place in 16O3.