Photodissociation of sulfur dioxide at 193 nm

Felder, P.; Effenhauser, Carlo S.; Haas, Bernd-Michael; Huber, J. Robert

doi:10.1016/0009-2614(88)87198-7

Cited by 50 publications

(43 citation statements)

References 14 publications

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“…Both the Fourier moments of the images and the resulting speed distributions show some structure, which is probably associated with the population of vibrational levels in the SO(X) cofragment. Similar structure has been observed previously at 193 nm in the TOF experiments of Kawasaki and Sato 16 and Huber and co-workers 15,37 and in the wavelength range of 202-207 nm by Houston and co-workers. 11 To estimate the SO vibrational populations, we fit the speed distributions shown in Figure 4 with a sum of Gaussian functions, each corresponding to the SO cofragment born in a different vibrational state.…”

Section: Spin-orbit State Populationssupporting

confidence: 78%

“…The data are very similar to those obtained previously at 193 nm. 8,[14][15][16]39 All studies agree that the most populated SO photofragment vibrational level is V ) 2, although there is some disagreement about the extent of the population of neighboring vibrational levels, 8,[14][15][16]39 probably arising from differences in energy resolution. In contrast to the rotational excitation, note that the vibrational distribution at 193 nm is found to be quite different from those obtained by Houston and co-workers 11 in the range of 202-207 nm.…”

Section: O( 3 P) Speed Distribution and So( 3 σ -) Internal State Popmentioning

confidence: 99%

“…The former two measurements provide confirmation of a number of previous findings. [14][15][16]33,37 The new results are presented in section 3, following a brief description of the experimental and data analysis procedures in section 2. In section 4, the data are discussed in light of a model in which the spin-orbit interaction in the recoiling O atom is included explicitly and in light of new theoretical calculations of the angular dependence of the long-range potential energy curves.…”

Section: Introductionmentioning

confidence: 99%

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O(³P_J) Alignment from the Photodissociation of SO₂ at 193 nm

et al. 2004

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The 193-nm photodissociation of SO 2 has been studied using the resonantly enhanced multiphoton ionization of ground-state O( 3 P J ), coupled with velocity-map ion imaging. The dependence of the ion images on the linear polarization of pump and probe radiation has been used to determine the electronic angular momentum alignment of the recoiling, state-selected atoms, together with their speed distribution and translational anisotropy. The polarization data for J ) 1 and 2 have been used to estimate the state multipole moments of the O-atom electron spin and orbital angular momenta. The data suggest that both sources of O-atom electronic angular momentum are polarized. It is shown that the spin polarization could either arise from exit-channel couplings or be a manifestation of the participation of triplet states in the dissociation. The angular dependence of the potential energy in the exit channel is examined using long-range quadrupole-dipole and quadrupolequadrupole interaction terms, from which molecular-frame multipole moments of the orbital angular momentum of the recoiling O atoms have been calculated. Comparison with the experimentally derived multipole moments is used to help provide insight into the dissociation mechanism. The results are also discussed in light of similar experimental data from the photodissociation of N 2 O.

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Section: Spin-orbit State Populationssupporting

confidence: 78%

Section: O( 3 P) Speed Distribution and So( 3 σ -) Internal State Popmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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O(³P_J) Alignment from the Photodissociation of SO₂ at 193 nm

et al. 2004

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“…5 that SO͑v =2͒ is the dominant vibrational state accompanying the production of the O͑ 3 P 2 ͒ fine structure state. This observation is consistent with previous photofragment translational spectroscopy studies at 193.3 nm by Brouard et al, 26 Felder et al, 27 and Kawasaki and Sato. 28 We have obtained the relative populations of the SO͑v =0,1,2, and 3͒ states based on the relative integrated areas of the P͑E c.m.…”

Section: B Identification Of High-n Rydberg States Of O and S Atoms supporting

confidence: 93%

High-resolution Rydberg tagging time-of-flight measurements of atomic photofragments by single-photon vacuum ultraviolet laser excitation

Jones

Zhou

Yang

et al. 2008

Review of Scientific Instruments

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By coupling a comprehensive tunable vacuum ultraviolet (VUV) laser system to a velocity-mapped ion imaging apparatus, we show that high-resolution high-n Rydberg tagging time-of-flight (TOF) measurements of nascent atomic photofragments formed by laser photodissociation can be made using single-photon VUV laser photoexcitation. To illustrate this single-photon Rydberg tagging TOF method, we present here the results of the VUV laser high-n Rydberg tagging TOF measurements of O((3)P(2)) and S((3)P(2)) formed in the photodissociation of SO(2) and CS(2) at 193.3 and 202.3 nm, respectively. These results are compared to those obtained by employing the VUV laser photoionization time-sliced velocity-mapped ion imaging technique. The fact that the kinetic energy resolutions achieved in the VUV laser high-n Rydberg tagging TOF measurements of O and S atoms are found to be higher than those observed in the VUV laser photoionization, time-sliced velocity-mapped ion imaging studies show that the single-photon VUV laser high-n Rydberg tagging TOF method is useful and complementary to state-of-the-art time-sliced velocity-mapped ion imaging measurements of heavier atomic photofragments, such as O and S atoms. Furthermore, the general agreement observed between the VUV laser high-n Rydberg tagging TOF and velocity-mapped ion imaging experiments supports the conclusion that the lifetimes of the tagged Rydberg states of O and S atoms are sufficiently long to allow the reliable determination of state-resolved UV photodissociation cross sections of SO(2) and CS(2) by using the VUV laser high-n Rydberg tagging TOF method.

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“…29,30 This approach generates fast O( 3 P) atoms with a range of recoil velocities. By choosing the delay between the photolysis and probe lasers, continuously tunable O( 3 P) velocities are obtained.…”

Section: Methodsmentioning

confidence: 99%