2012
DOI: 10.1007/s12039-012-0226-4
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Dynamics of the dissociative electron attachment in H2O and D2O: The A1 resonance and axial recoil approximation#

Abstract: The dynamics of the formation and decay of negative ion resonance of A 1 symmetry at 8.5 eV electron energy in the dissociative electron attachment (DEA) process in H 2 O and D 2 O are investigated using the velocity slice imaging technique. While the highest energy hydride ions formed by DEA show angular distributions characteristic to the A 1 symmetry, those formed with low-kinetic energy show considerably different angular distributions indicating changes in the orientation of the dissociating bond due to b… Show more

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Cited by 9 publications
(6 citation statements)
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“…Due to this longer dissociation time, the TNI experiences more rotation. 32 Along with that the rotation of the TNI affects the low kinetic energy ions significantly. 33 The observed isotropy found in the angular distribution of S 2 − ions may be due to the above-mentioned effects.…”
Section: Resultsmentioning
confidence: 99%
See 1 more Smart Citation
“…Due to this longer dissociation time, the TNI experiences more rotation. 32 Along with that the rotation of the TNI affects the low kinetic energy ions significantly. 33 The observed isotropy found in the angular distribution of S 2 − ions may be due to the above-mentioned effects.…”
Section: Resultsmentioning
confidence: 99%
“…A similar result was previously found by Ram et al in DEA to water. 32 However, since no past calculation to date conclusively suggests the resonant symmetry responsible for the 7.7 eV resonance, we can't conclude much about the detailed dissociation dynamics involved and the validity of axial recoil approximation in this resonance from the angular distributions. Also, the different three-body dissociation channels [channels (c), (d), and (e)] become accessible in the 7.7 eV resonance.…”
Section: Production Of S à and Cs à Ionsmentioning
confidence: 87%
“…A similar result was previously found by Ram et al in DEA to water. [29] There is no past theoretical calculation to suggest which resonance symmetry is involved in the 7.7 eV resonance. To get more insights into the dynamics involved in this resonance, sophisticated dynamic simulations of the nuclear motions should be theoretically performed on the multi-dimensional potential energy surface of the TNI state.…”
Section: Angular Distribution Of S − Ionsmentioning
confidence: 99%
“…The negative ion formation of water bare molecules has been attracting the attention of the international scientific community for at least 90 years, though we still note a global interest in investigating the electronic state spectroscopy of its anionic states. Dissociative electron attachment (DEA) to H 2 O has been reported on several occasions by experimental and theoretical methodologies, , although a global consensus about the nuclear dynamics governing the lowest-energy Feshbach resonances of H – and O – has not yet been reached. , Additionally, the anionic fragments 1u, 16u, and 17u were reported from electron transfer experiments in high-energy (1–4 keV) collisions of H – , O – , and OH – with water molecules . Regardless, theoretical calculations related to water 2 B 1 , 2 A 1 , and 2 B 2 Feshbach resonances have been employed to obtain cross sections for DEA ,, and the potential energy surfaces of such metastable states. , Electron scattering , and ion scattering, and electronic excitation ,,, in single water molecules and aggregates, have been reported, while H 2 O bond dissociation energies have been determined by experimental and theoretical methods .…”
mentioning
confidence: 99%
“…The energy loss required to access a molecule’s electronic state, Δ E , is given by the difference between the ionization energy of the potassium atom, IE­(K), and the electron affinity of that state at its maximum intensity, EA­( I max ), as Δ E = IE­(K) – EA­( I max ) . A close inspection of Figure shows that the energy loss peaks of H 2 O and D 2 O have maximum intensities ( I max ) at 13.95 ± 0.30 eV, resulting in vertical electron affinities of −9.61 ± 0.3 eV, closely related to the broad DEA resonance features at ∼9 eV , ,, (Table ).…”
mentioning
confidence: 99%