Kinetic energy distribution of excited H atoms produced through dissociative photoionization excitation of H sub 2

Journal Article · Thu Feb 01 04:00:00 EST 1990 · Journal of Chemical Physics; (USA)

DOI:https://doi.org/10.1063/1.458053· OSTI ID:6990585

Wu, C Y.R.; Chien, T S; Judge, D L ^[1]

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1. Department of Physics and Space Sciences Center, University of Southern California, Los Angeles, California 90089-1341 (US)

The kinetic energy distributions of {ital excited} hydrogen atoms produced in the dissociative photoionization excitation of H{sub 2} by He II 304 A photons have been obtained. A fluorescence photon--photoion coincidence technique has been utilized in the present study. A coincidence spectrum showing a broad peak with a weak shoulder corresponding to a time delay of 5.6--7.5 {mu}s is obtained. The kinetic energy distribution of the peak is between 1.2 and 7.5 eV with a maximum at 4.2 eV indicating that this peak is attributable to the lowest energy dissociative photoionization excitation processes which correlate with H(2{ital l})+H{sup +}. The relative partial cross sections for direct dissociative photoionization excitation through the 2{ital p}{pi}{sub {ital u}} and 2{ital s}{sigma}{sub {ital g}} states at 304 A are determined to be 1: 0.25.

• OSTI ID: 6990585
• Journal Information: Journal of Chemical Physics; (USA), Journal Name: Journal of Chemical Physics; (USA) Vol. 92:3; ISSN JCPSA; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
540110
640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
ATMOSPHERIC CHEMISTRY
CHEMISTRY
COINCIDENCE METHODS
COUNTING TECHNIQUES
DISSOCIATION
DISTRIBUTION
ELECTROMAGNETIC RADIATION
ELEMENTS
ENERGY
HYDROGEN
IONIZATION
KINETIC ENERGY
NONMETALS
PHOTOIONIZATION
RADIATIONS
SOLAR RADIATION
STELLAR RADIATION
ULTRAVIOLET RADIATION