Formation and relaxation of rovibrationally excited H2 molecules due to plasma-surface interaction

O.G. Gabriel, D.C. Schram, R.A.H. Engeln

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

18 Citaties (Scopus)
75 Downloads (Pure)

Uittreksel

We report on the interaction of hydrogen atoms and molecules under high flux conditions with a cooled copper surface and its impact on gas phase densities and internal excitation of the molecules. These densities were measured by means of laser-induced fluorescence using tunable radiation sources in the vacuum-ultraviolet (vuv). While H atoms were detected by two-photon absorption laser-induced fluorescence, the necessary vuv radiation for the detection of rovibrationally excited H2 molecules in the electronic ground state were produced by stimulated anti-Stokes Raman scattering. The results reveal a strong loss mechanism of H atoms and the formation of rovibrationally excited H2 molecules due to surface interaction. The surface reaction probability of H atoms under high flux conditions on copper was estimated. Surface collisions are shown to have a profound influence on the density distribution of rovibrationally excited H2 molecules: The distributions follow lower temperatures and are less Boltzmann-like, i.e., the distributions of the internal excitation of H2 molecules differ more from thermodynamic equilibrium.
Originele taal-2Engels
Artikelnummer016407
Pagina's (van-tot)016407-1/8
Aantal pagina's8
TijdschriftPhysical Review E - Statistical, Nonlinear, and Soft Matter Physics
Volume78
Nummer van het tijdschrift1
DOI's
StatusGepubliceerd - 2008

Vingerafdruk

surface reactions
Plasma
Molecules
Interaction
Laser-induced Fluorescence
molecules
Copper
Ultraviolet
laser induced fluorescence
Vacuum
Excitation
Radiation
Internal
atoms
far ultraviolet radiation
Two-photon Absorption
copper
Raman Spectra
Thermodynamic Equilibrium
Hydrogen Atom

Citeer dit

@article{316213053e4b416695bc50cc4a12d375,
title = "Formation and relaxation of rovibrationally excited H2 molecules due to plasma-surface interaction",
abstract = "We report on the interaction of hydrogen atoms and molecules under high flux conditions with a cooled copper surface and its impact on gas phase densities and internal excitation of the molecules. These densities were measured by means of laser-induced fluorescence using tunable radiation sources in the vacuum-ultraviolet (vuv). While H atoms were detected by two-photon absorption laser-induced fluorescence, the necessary vuv radiation for the detection of rovibrationally excited H2 molecules in the electronic ground state were produced by stimulated anti-Stokes Raman scattering. The results reveal a strong loss mechanism of H atoms and the formation of rovibrationally excited H2 molecules due to surface interaction. The surface reaction probability of H atoms under high flux conditions on copper was estimated. Surface collisions are shown to have a profound influence on the density distribution of rovibrationally excited H2 molecules: The distributions follow lower temperatures and are less Boltzmann-like, i.e., the distributions of the internal excitation of H2 molecules differ more from thermodynamic equilibrium.",
author = "O.G. Gabriel and D.C. Schram and R.A.H. Engeln",
year = "2008",
doi = "10.1103/PhysRevE.78.016407",
language = "English",
volume = "78",
pages = "016407--1/8",
journal = "Physical Review E - Statistical, Nonlinear, and Soft Matter Physics",
issn = "1539-3755",
publisher = "American Physical Society",
number = "1",

}

Formation and relaxation of rovibrationally excited H2 molecules due to plasma-surface interaction. / Gabriel, O.G.; Schram, D.C.; Engeln, R.A.H.

In: Physical Review E - Statistical, Nonlinear, and Soft Matter Physics, Vol. 78, Nr. 1, 016407, 2008, blz. 016407-1/8.

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

TY - JOUR

T1 - Formation and relaxation of rovibrationally excited H2 molecules due to plasma-surface interaction

AU - Gabriel, O.G.

AU - Schram, D.C.

AU - Engeln, R.A.H.

PY - 2008

Y1 - 2008

N2 - We report on the interaction of hydrogen atoms and molecules under high flux conditions with a cooled copper surface and its impact on gas phase densities and internal excitation of the molecules. These densities were measured by means of laser-induced fluorescence using tunable radiation sources in the vacuum-ultraviolet (vuv). While H atoms were detected by two-photon absorption laser-induced fluorescence, the necessary vuv radiation for the detection of rovibrationally excited H2 molecules in the electronic ground state were produced by stimulated anti-Stokes Raman scattering. The results reveal a strong loss mechanism of H atoms and the formation of rovibrationally excited H2 molecules due to surface interaction. The surface reaction probability of H atoms under high flux conditions on copper was estimated. Surface collisions are shown to have a profound influence on the density distribution of rovibrationally excited H2 molecules: The distributions follow lower temperatures and are less Boltzmann-like, i.e., the distributions of the internal excitation of H2 molecules differ more from thermodynamic equilibrium.

AB - We report on the interaction of hydrogen atoms and molecules under high flux conditions with a cooled copper surface and its impact on gas phase densities and internal excitation of the molecules. These densities were measured by means of laser-induced fluorescence using tunable radiation sources in the vacuum-ultraviolet (vuv). While H atoms were detected by two-photon absorption laser-induced fluorescence, the necessary vuv radiation for the detection of rovibrationally excited H2 molecules in the electronic ground state were produced by stimulated anti-Stokes Raman scattering. The results reveal a strong loss mechanism of H atoms and the formation of rovibrationally excited H2 molecules due to surface interaction. The surface reaction probability of H atoms under high flux conditions on copper was estimated. Surface collisions are shown to have a profound influence on the density distribution of rovibrationally excited H2 molecules: The distributions follow lower temperatures and are less Boltzmann-like, i.e., the distributions of the internal excitation of H2 molecules differ more from thermodynamic equilibrium.

U2 - 10.1103/PhysRevE.78.016407

DO - 10.1103/PhysRevE.78.016407

M3 - Article

C2 - 18764067

VL - 78

SP - 016407-1/8

JO - Physical Review E - Statistical, Nonlinear, and Soft Matter Physics

JF - Physical Review E - Statistical, Nonlinear, and Soft Matter Physics

SN - 1539-3755

IS - 1

M1 - 016407

ER -