Excitation of water molecules by electron impact with formation of OH-radicals in the A2Σ+ state

M. A. Khodorkovskii, S. V. Murashov, T. O. Artamonova, L. P. Rakcheeva, A. A. Beliaeva, A. L. Shakhmin, D. Michael, N. A. Timofeev, A. S. Mel'Nikov, I. A. Shevkunov, G. Zissis

Research output

8 Citations (Scopus)

Abstract

The excitation cross-sections of the OH-radical band A2Σ + → X2 (v′ = 0 → v″ = 0, v′ = 1 → v″ = 1) were measured. OH-radicals were formed during dissociation of water molecules by electron impact in the conditions of crossing of supersonic molecular and electron beams in the energy range 10-120 eV. Measurements were conducted at temperatures of 50, 80 and 200 K. It was shown that the excitation function had a sharp maximum in the region of low energies (at 16 eV) and an extended plateau up to 120 eV. It is proved that there are two channels of molecule dissociation with formation OH (A2Σ +) through excitation of either the triplet b3A 1 or the singlet B1A1 states of H2O molecules. The form of the excitation function essentially depends on the temperature of water vapours in the beam. With the decrease of the water molecule temperature the height of the plateau in the region 30-120 eV decreases in comparison with that of the peak at 16 eV. The absolute value of the excitation cross-section of the OH band at the temperature 50 K has been measured. It is equal to (1.6 ± 0.5) × 10-18 cm 2 in the maximum at 16 eV. The ratio of cross-sections of bands 1-1 and 0-0 weakly depends on the energy of the exciting electron in the range 12-120 eV and is equal to 0.28 ± 0.05. The appearance threshold is equal to (9.1 ± 0.5) eV.

Original languageEnglish
Article number215201
JournalJournal of Physics B: Atomic, Molecular and Optical Physics
Volume42
Issue number21
DOIs
Publication statusPublished - 25 Nov 2009

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electron impact
water
excitation
molecules
plateaus
cross sections
dissociation
temperature
molecular beams
water vapor
energy
electron beams
thresholds
electrons

Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics

Cite this

Khodorkovskii, M. A. ; Murashov, S. V. ; Artamonova, T. O. ; Rakcheeva, L. P. ; Beliaeva, A. A. ; Shakhmin, A. L. ; Michael, D. ; Timofeev, N. A. ; Mel'Nikov, A. S. ; Shevkunov, I. A. ; Zissis, G. / Excitation of water molecules by electron impact with formation of OH-radicals in the A2Σ+ state. In: Journal of Physics B: Atomic, Molecular and Optical Physics. 2009 ; Vol. 42, No. 21.
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title = "Excitation of water molecules by electron impact with formation of OH-radicals in the A2Σ+ state",
abstract = "The excitation cross-sections of the OH-radical band A2Σ + → X2 (v′ = 0 → v″ = 0, v′ = 1 → v″ = 1) were measured. OH-radicals were formed during dissociation of water molecules by electron impact in the conditions of crossing of supersonic molecular and electron beams in the energy range 10-120 eV. Measurements were conducted at temperatures of 50, 80 and 200 K. It was shown that the excitation function had a sharp maximum in the region of low energies (at 16 eV) and an extended plateau up to 120 eV. It is proved that there are two channels of molecule dissociation with formation OH (A2Σ +) through excitation of either the triplet b3A 1 or the singlet B1A1 states of H2O molecules. The form of the excitation function essentially depends on the temperature of water vapours in the beam. With the decrease of the water molecule temperature the height of the plateau in the region 30-120 eV decreases in comparison with that of the peak at 16 eV. The absolute value of the excitation cross-section of the OH band at the temperature 50 K has been measured. It is equal to (1.6 ± 0.5) × 10-18 cm 2 in the maximum at 16 eV. The ratio of cross-sections of bands 1-1 and 0-0 weakly depends on the energy of the exciting electron in the range 12-120 eV and is equal to 0.28 ± 0.05. The appearance threshold is equal to (9.1 ± 0.5) eV.",
author = "Khodorkovskii, {M. A.} and Murashov, {S. V.} and Artamonova, {T. O.} and Rakcheeva, {L. P.} and Beliaeva, {A. A.} and Shakhmin, {A. L.} and D. Michael and Timofeev, {N. A.} and Mel'Nikov, {A. S.} and Shevkunov, {I. A.} and G. Zissis",
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Khodorkovskii, MA, Murashov, SV, Artamonova, TO, Rakcheeva, LP, Beliaeva, AA, Shakhmin, AL, Michael, D, Timofeev, NA, Mel'Nikov, AS, Shevkunov, IA & Zissis, G 2009, 'Excitation of water molecules by electron impact with formation of OH-radicals in the A2Σ+ state', Journal of Physics B: Atomic, Molecular and Optical Physics, vol. 42, no. 21, 215201. https://doi.org/10.1088/0953-4075/42/21/215201

Excitation of water molecules by electron impact with formation of OH-radicals in the A2Σ+ state. / Khodorkovskii, M. A.; Murashov, S. V.; Artamonova, T. O.; Rakcheeva, L. P.; Beliaeva, A. A.; Shakhmin, A. L.; Michael, D.; Timofeev, N. A.; Mel'Nikov, A. S.; Shevkunov, I. A.; Zissis, G.

In: Journal of Physics B: Atomic, Molecular and Optical Physics, Vol. 42, No. 21, 215201, 25.11.2009.

Research output

TY - JOUR

T1 - Excitation of water molecules by electron impact with formation of OH-radicals in the A2Σ+ state

AU - Khodorkovskii, M. A.

AU - Murashov, S. V.

AU - Artamonova, T. O.

AU - Rakcheeva, L. P.

AU - Beliaeva, A. A.

AU - Shakhmin, A. L.

AU - Michael, D.

AU - Timofeev, N. A.

AU - Mel'Nikov, A. S.

AU - Shevkunov, I. A.

AU - Zissis, G.

PY - 2009/11/25

Y1 - 2009/11/25

N2 - The excitation cross-sections of the OH-radical band A2Σ + → X2 (v′ = 0 → v″ = 0, v′ = 1 → v″ = 1) were measured. OH-radicals were formed during dissociation of water molecules by electron impact in the conditions of crossing of supersonic molecular and electron beams in the energy range 10-120 eV. Measurements were conducted at temperatures of 50, 80 and 200 K. It was shown that the excitation function had a sharp maximum in the region of low energies (at 16 eV) and an extended plateau up to 120 eV. It is proved that there are two channels of molecule dissociation with formation OH (A2Σ +) through excitation of either the triplet b3A 1 or the singlet B1A1 states of H2O molecules. The form of the excitation function essentially depends on the temperature of water vapours in the beam. With the decrease of the water molecule temperature the height of the plateau in the region 30-120 eV decreases in comparison with that of the peak at 16 eV. The absolute value of the excitation cross-section of the OH band at the temperature 50 K has been measured. It is equal to (1.6 ± 0.5) × 10-18 cm 2 in the maximum at 16 eV. The ratio of cross-sections of bands 1-1 and 0-0 weakly depends on the energy of the exciting electron in the range 12-120 eV and is equal to 0.28 ± 0.05. The appearance threshold is equal to (9.1 ± 0.5) eV.

AB - The excitation cross-sections of the OH-radical band A2Σ + → X2 (v′ = 0 → v″ = 0, v′ = 1 → v″ = 1) were measured. OH-radicals were formed during dissociation of water molecules by electron impact in the conditions of crossing of supersonic molecular and electron beams in the energy range 10-120 eV. Measurements were conducted at temperatures of 50, 80 and 200 K. It was shown that the excitation function had a sharp maximum in the region of low energies (at 16 eV) and an extended plateau up to 120 eV. It is proved that there are two channels of molecule dissociation with formation OH (A2Σ +) through excitation of either the triplet b3A 1 or the singlet B1A1 states of H2O molecules. The form of the excitation function essentially depends on the temperature of water vapours in the beam. With the decrease of the water molecule temperature the height of the plateau in the region 30-120 eV decreases in comparison with that of the peak at 16 eV. The absolute value of the excitation cross-section of the OH band at the temperature 50 K has been measured. It is equal to (1.6 ± 0.5) × 10-18 cm 2 in the maximum at 16 eV. The ratio of cross-sections of bands 1-1 and 0-0 weakly depends on the energy of the exciting electron in the range 12-120 eV and is equal to 0.28 ± 0.05. The appearance threshold is equal to (9.1 ± 0.5) eV.

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