Resonance ionization detection of neutral 0(2Pj) produced from stimulated surface processes

T. M. Orlando, A. R. Burns, Ellen Stechel, D. R. Jennison

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

We report the first quantum-state specific detection of ground-state atomic oxygen 0(3P) above an electron irradiated adsorbate-covered surface using laser resonance-enhanced multiphoton ionization spectroscopy. Electron-stimulated desorption of O(3P., is not observed from an O-covered Pt(111) surface, but 0(3P) fragments are produced from electron-stimulated dissociation of NO2(fl) coadsorbed with O (#o=0.75 ML) on Pt(111). The 9-10 eV threshold for O(3P,) formation correlates with that observed for NO2(fl) dissociation. The measured OCPj) spin-orbit state distribution is (5.0):(2.5): (1.0) for.1 1, and 0, respectively. This is within experimental error of the 2./ + 1 statistical (T— oo) limit. No gas phase OCPj) is detected from the stimulated dissociation of adsorbed O2 on Pt (111); however, we have utilized the O (\\\\\\\\P,) detection capability as an indirect probe of NO2 production from an electron-stimulatedsurface reaction between coadsorbed O2 and NO on Pt (The NO2 is detected by laser photolysis above the surface. The — 10-eV NO2 production threshold correlates with dissociative ionization from the 3agmolecularbonding orbital of O2{a). Dissociative ionization can produce energetic O atoms which may then react with a coadsorbed NO, producing an NO2 desorbate.

Original languageEnglish
Pages (from-to)1769-1773
Number of pages5
JournalJournal of Vacuum Science and Technology A: Vacuum, Surfaces and Films
Volume9
Issue number3
DOIs
Publication statusPublished - 1991

Fingerprint

Ionization
ionization
Electrons
dissociation
electrons
thresholds
Lasers
Photolysis
Adsorbates
Ground state
lasers
photolysis
Desorption
Orbits
Gases
desorption
fragments
Spectroscopy
vapor phases
Oxygen

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

Cite this

Resonance ionization detection of neutral 0(2Pj) produced from stimulated surface processes. / Orlando, T. M.; Burns, A. R.; Stechel, Ellen; Jennison, D. R.

In: Journal of Vacuum Science and Technology A: Vacuum, Surfaces and Films, Vol. 9, No. 3, 1991, p. 1769-1773.

Research output: Contribution to journalArticle

@article{3b5a4a242b8d448c9e45111f8302633b,
title = "Resonance ionization detection of neutral 0(2Pj) produced from stimulated surface processes",
abstract = "We report the first quantum-state specific detection of ground-state atomic oxygen 0(3P) above an electron irradiated adsorbate-covered surface using laser resonance-enhanced multiphoton ionization spectroscopy. Electron-stimulated desorption of O(3P., is not observed from an O-covered Pt(111) surface, but 0(3P) fragments are produced from electron-stimulated dissociation of NO2(fl) coadsorbed with O (#o=0.75 ML) on Pt(111). The 9-10 eV threshold for O(3P,) formation correlates with that observed for NO2(fl) dissociation. The measured OCPj) spin-orbit state distribution is (5.0):(2.5): (1.0) for.1 1, and 0, respectively. This is within experimental error of the 2./ + 1 statistical (T— oo) limit. No gas phase OCPj) is detected from the stimulated dissociation of adsorbed O2 on Pt (111); however, we have utilized the O (\\\\\\\\P,) detection capability as an indirect probe of NO2 production from an electron-stimulatedsurface reaction between coadsorbed O2 and NO on Pt (The NO2 is detected by laser photolysis above the surface. The — 10-eV NO2 production threshold correlates with dissociative ionization from the 3agmolecularbonding orbital of O2{a). Dissociative ionization can produce energetic O atoms which may then react with a coadsorbed NO, producing an NO2 desorbate.",
author = "Orlando, {T. M.} and Burns, {A. R.} and Ellen Stechel and Jennison, {D. R.}",
year = "1991",
doi = "10.1116/1.577459",
language = "English",
volume = "9",
pages = "1769--1773",
journal = "Journal of Vacuum Science and Technology A",
issn = "0734-2101",
publisher = "AVS Science and Technology Society",
number = "3",

}

TY - JOUR

T1 - Resonance ionization detection of neutral 0(2Pj) produced from stimulated surface processes

AU - Orlando, T. M.

AU - Burns, A. R.

AU - Stechel, Ellen

AU - Jennison, D. R.

PY - 1991

Y1 - 1991

N2 - We report the first quantum-state specific detection of ground-state atomic oxygen 0(3P) above an electron irradiated adsorbate-covered surface using laser resonance-enhanced multiphoton ionization spectroscopy. Electron-stimulated desorption of O(3P., is not observed from an O-covered Pt(111) surface, but 0(3P) fragments are produced from electron-stimulated dissociation of NO2(fl) coadsorbed with O (#o=0.75 ML) on Pt(111). The 9-10 eV threshold for O(3P,) formation correlates with that observed for NO2(fl) dissociation. The measured OCPj) spin-orbit state distribution is (5.0):(2.5): (1.0) for.1 1, and 0, respectively. This is within experimental error of the 2./ + 1 statistical (T— oo) limit. No gas phase OCPj) is detected from the stimulated dissociation of adsorbed O2 on Pt (111); however, we have utilized the O (\\\\\\\\P,) detection capability as an indirect probe of NO2 production from an electron-stimulatedsurface reaction between coadsorbed O2 and NO on Pt (The NO2 is detected by laser photolysis above the surface. The — 10-eV NO2 production threshold correlates with dissociative ionization from the 3agmolecularbonding orbital of O2{a). Dissociative ionization can produce energetic O atoms which may then react with a coadsorbed NO, producing an NO2 desorbate.

AB - We report the first quantum-state specific detection of ground-state atomic oxygen 0(3P) above an electron irradiated adsorbate-covered surface using laser resonance-enhanced multiphoton ionization spectroscopy. Electron-stimulated desorption of O(3P., is not observed from an O-covered Pt(111) surface, but 0(3P) fragments are produced from electron-stimulated dissociation of NO2(fl) coadsorbed with O (#o=0.75 ML) on Pt(111). The 9-10 eV threshold for O(3P,) formation correlates with that observed for NO2(fl) dissociation. The measured OCPj) spin-orbit state distribution is (5.0):(2.5): (1.0) for.1 1, and 0, respectively. This is within experimental error of the 2./ + 1 statistical (T— oo) limit. No gas phase OCPj) is detected from the stimulated dissociation of adsorbed O2 on Pt (111); however, we have utilized the O (\\\\\\\\P,) detection capability as an indirect probe of NO2 production from an electron-stimulatedsurface reaction between coadsorbed O2 and NO on Pt (The NO2 is detected by laser photolysis above the surface. The — 10-eV NO2 production threshold correlates with dissociative ionization from the 3agmolecularbonding orbital of O2{a). Dissociative ionization can produce energetic O atoms which may then react with a coadsorbed NO, producing an NO2 desorbate.

UR - http://www.scopus.com/inward/record.url?scp=84961291753&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84961291753&partnerID=8YFLogxK

U2 - 10.1116/1.577459

DO - 10.1116/1.577459

M3 - Article

VL - 9

SP - 1769

EP - 1773

JO - Journal of Vacuum Science and Technology A

JF - Journal of Vacuum Science and Technology A

SN - 0734-2101

IS - 3

ER -