H/D isotope effect in the predissociation of C sub 2 HD

Journal Article · Sat Sep 01 04:00:00 EDT 1990 · Journal of Chemical Physics; (USA)

DOI:https://doi.org/10.1063/1.458801· OSTI ID:6416297

Cool, T A ^[1]; Goodwin, P M; Otis, C E ^[2]

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1. School of Applied and Engineering Physics, Cornell University, Ithaca, NY (USA)
2. Laser Spectroscopy Laboratory, Department T13, IBM Endicott, Endicott, NY (USA)

Resonance-enhanced multiphoton ionization (2+1 REMPI) spectroscopy near 243 nm was used to detect H and D photofragments of the 193 nm photolysis of C{sub 2}HD. Measurements were performed in a molecular beam, laser photolysis apparatus, equipped with a time-of-flight mass spectrometer. The measured H/D ratio of 2.85{plus minus}0.3 may indicate nonadiabatic surface hopping occurs between 2 {sup 3}{ital A}{prime} and 1 {sup 3}{ital A}{prime} and/or 2 {sup 1}{ital A}{prime}and 1 {sup 1}{ital A}{prime}surfaces in exit channels leading to ground state C{sub 2}H({ital {tilde X}} {sup 2}{Sigma}{sup +})+H({sup 2}{ital S}) fragments in the predissociation of C{sub 2}H{sub 2}.

• OSTI ID: 6416297
• Journal Information: Journal of Chemical Physics; (USA), Journal Name: Journal of Chemical Physics; (USA) Vol. 93:5; ISSN JCPSA; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400500 -- Photochemistry
640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
ACETYLENE
ALKYNES
BEAMS
BRANCHING RATIO
CHEMICAL REACTIONS
DECOMPOSITION
DEUTERIUM
DEUTERIUM COMPOUNDS
DISSOCIATION
HYDROCARBONS
HYDROGEN COMPOUNDS
HYDROGEN ISOTOPES
ISOTOPE EFFECTS
ISOTOPES
LIGHT NUCLEI
MOLECULAR BEAMS
NUCLEI
ODD-ODD NUCLEI
ORGANIC COMPOUNDS
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
PREDISSOCIATION
STABLE ISOTOPES