Low energy electron collisions in H2S and H2Se: Structure in dissociative attachment cross-sections

Abouaf, R.; Teillet‐Billy, D.

doi:10.1016/j.ijms.2008.05.035

Cited by 6 publications

(5 citation statements)

References 34 publications

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“…Electrons with kinetic energies as small as 0.8 eV cannot induce formation of SH À and S À . Energies of 1.58 and 1.06 eV, respectively, are necessary for their formation by electron attachment to H 2 S as recently found by Abouaf et al 23 Photoexcitation of negatively charged species by the laser pulse can be excluded due to the time delay between laser induced electron emission and electron attachment. In the following, some possible mechanisms of the formation of HS 2 À and DS 2 À are listed.…”

Section: Preparation Of Hssupporting

confidence: 52%

Photodetachment-photoelectron spectroscopy of disulfanide: the ground and first excited electronic state of HS2 and DS2

Entfellner

Boesl

2009

Phys. Chem. Chem. Phys.

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Photodetachment-photoelectron spectra of HS(2)(-) and DS(2)(-) are presented. The obtained electron affinities (EA (HS(2)) = 1.916 +/- 0.015 eV and EA (DS(2)) = 1.918 +/- 0.015 eV) are in good agreement with earlier results (S. Moran and G. B. Ellison, J. Phys. Chem., 1988, 92, 1794). Photodetachment into the neutral ground state of the radicals HS(2) and DS(2) leads to excitation of the S-S stretching mode, whereas photodetachment into the first excited state causes a S-S-H bending and a weak S-H stretching motion. Additionally, weak peaks of S(2) were observed in the spectra of HS(2) and DS(2), leading to the conclusion that photodetachment with 2.77 eV (448 nm) causes dissociation of HS(2)(-) and DS(2)(-) into S(2)(-) and H/D. Taking 2.77 eV as an upper limit for D(0)(S(2)(-)-H) a lower limit for Delta(f)H(0)(HS(2 (g))) of 100.8 kJ mol(-1) is obtained which is an improvement on the literature value of 107.145 +/- 10.46 kJ mol(-1).

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Section: Preparation Of Hssupporting

confidence: 52%

Photodetachment-photoelectron spectroscopy of disulfanide: the ground and first excited electronic state of HS2 and DS2

Entfellner

Boesl

2009

Phys. Chem. Chem. Phys.

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“…However, SH À has been found to be present only at the 2.4 eV resonance, while the S À intensity is very weak (3% of SH À ) at this resonance. 14 Thus we may assume that the heavy fragments are SH À at the 2.4 eV resonance and S À at the remaining higher energy resonances for all practical purposes. One can observe clear peaks in the H À curve at 5.2 and 7.5 eV and a broad shoulder centered at 9.6 eV.…”

Section: Resultsmentioning

confidence: 99%

Dissociative electron attachment to H2S probed by ion momentum imaging

Ram

Krishnakumar

2011

Phys. Chem. Chem. Phys.

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The dissociation dynamics of negative ion resonance states in H(2)S formed upon electron attachment are studied using momentum imaging of the fragment H(-) and S(-) ions and compared with similar resonances in water. The H(-) momentum images show that dissociation dynamics at the 5.2 eV resonance are very similar to those of the 6.5 eV (B(1)) resonance in water. Unlike the 8.5 eV resonance in water, which has A(1) symmetry but is found to display considerable deviation from the axial recoil approximation in the momentum distribution of H(-) ions, the distribution from the corresponding resonance in H(2)S at 7.5 eV is found to follow the axial recoil approximation fairly well. The resonance state with B(2) symmetry at 10 eV is found to decay via four dissociation channels viz.-H(-) + H + S, H(-) + SH(A(2)Σ), H(-) + SH(X(2)Π) and S(-) + H + H channels, similar to those that were seen in the B(2) resonance in water at 12 eV, including sequential fragmentation in the multiple fragmentation channels. However, the angular distributions for the fragment ions from this resonance are found to be distinctly different from those in water, even while displaying considerable deviation from the axial recoil approximation similar to that in water.

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“…It is worth noting that in H 2 S as well, only S À and no SH À were observed at this electron energy. 20 At 8 eV, we also see the SH À ions with almost the same intensity as that of S À ions. However, we do not see a substantial change in the KE distribution, whereas the anisotropy increases compared to the 7 eV image.…”

Section: (B) and (E))mentioning

confidence: 53%

“…It is worth noting that in H 2 S as well, only S − and no SH − were observed at this electron energy. 20…”

Section: Resultsmentioning

confidence: 99%

“…19 On the other hand, in DEA to H 2 S, SH À ions are reported at 2.4 eV. 14,20 Interestingly, both simple alcohols 21,22 and thiols 12 This journal is © the Owner Societies 2024 have shown the production of OH À and SH À ions, respectively. Moreover, the systematic investigations on simple organic alcohols have shown the presence of an H À channel at around 6.5 eV that arises from the hydroxyl group and shows strong functional group dependence.…”

Section: Introductionmentioning

confidence: 99%

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