Quantitative determination of H sub 2 , HD, and D sub 2 internal-state distributions by (2+1) resonance-enhanced multiphoton ionization

Journal Article · Mon Jul 01 04:00:00 EDT 1991 · Journal of Chemical Physics; (USA)

DOI:https://doi.org/10.1063/1.461478· OSTI ID:5467714

Rinnen, K; Buntine, M A; Kliner, D A.V.; Zare, R N ^[1]; Huo, W M ^[2]

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1. Department of Chemistry, Stanford University, Stanford, California 94305 (USA)
2. NASA Ames Research Center, Moffett Field, California 94035 (USA)

The relationship between quantum-state populations and ion signals in (2+1) resonance-enhanced multiphoton ionization (REMPI) detection of H{sub 2}, HD, and D{sub 2} via the {ital E}, {ital F} {sup 1}{Sigma}{sup +}{sub {ital g}} ({ital v}{sup {prime}}{sub {ital E}}=0, {ital J}{prime}={ital J}{double prime})--{ital X} {sup 1}{Sigma}{sup +}{sub {ital g}} ({ital v}{double prime},{ital J}{double prime}) transition is determined by calibration against a thermal effusive source. Correction factors are obtained for 102 rovibrational levels for {ital v}{double prime}=0, 1, and 2 and {ital J}{double prime} ranging from 0 to 17. Within a given {ital v}{double prime}, rotational correction factors are nearly unity except for the highest {ital J}{double prime} levels. The vibrational correction factors vary with {ital v}{double prime}; (2+1) REMPI detection is 2--3 times more sensitive to {ital v}{double prime}=1 and 2 than to {ital v}{double prime}=0. Experimental correction factors are compared with those derived from a theoretical calculation of the two-photon transition moments by Huo {ital et} {ital al}. (J. Chem. Phys. {bold 95}, xxxx (1991)). In general, the agreement is excellent, which suggests that theoretical correction factors may be used when experimental ones are unavailable.

• OSTI ID: 5467714
• Journal Information: Journal of Chemical Physics; (USA), Journal Name: Journal of Chemical Physics; (USA) Vol. 95:1; ISSN JCPSA; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
DEUTERIDES
DEUTERIUM
DEUTERIUM COMPOUNDS
ELEMENTS
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITED STATES
HYDROGEN
HYDROGEN COMPOUNDS
HYDROGEN DEUTERIDE
HYDROGEN ISOTOPES
IONIZATION
ISOTOPES
LIGHT NUCLEI
MULTI-PHOTON PROCESSES
NONMETALS
NUCLEI
ODD-ODD NUCLEI
PHOTOIONIZATION
ROTATIONAL STATES
STABLE ISOTOPES
VIBRATIONAL STATES