Isotopic variants of the H + H/sub 2/ reaction. 1. Total reaction cross sections of the H + D/sub 2/ and H + HD reactions as a function of relative energy

Journal Article · Thu Oct 08 04:00:00 EDT 1987 · J. Phys. Chem.; (United States)

DOI:https://doi.org/10.1021/j100305a013· OSTI ID:5760640

Johnston, G W; Katz, B; Tsukiyama, K; Bersohn, R

The total cross sections for the reactions H + D/sub 2/ = HD + D and H + HD = H/sub 2/ + D have been measured as a function of relative initial translational energy in the ranges 0.87 to 2.70 and 0.82 to 1.86 eV, respectively. The technical for measuring the rate constant exploits the fact that the atomic product and reactant have very similar absorption wavelengths and that nearly monoenergetic hydrogen atoms can be generated by photodissociation of particular small molecules. Detection of the hydrogen atoms was carried out by laser-induced fluorescence at such short times that single collision conditions prevailed. The measured cross sections are in excellent agreement with the classical trajectory calculations of Blais and Truhlar and Schechter and Levine. As a byproduct of these experiments it was shown by Doppler spectroscopy that at the wavelengths 248 and 193 nm the transition dipole moment for H/sub 2/S is perpendicular to the molecular plane and that almost all of the available energy in this photodissociation is released into translation.

• Research Organization: Columbia Univ., New York, NY
• OSTI ID: 5760640
• Journal Information: J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 91:21; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400202* -- Isotope Effects
Isotope Exchange
& Isotope Separation
640304 -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ATOM COLLISIONS
ATOM-MOLECULE COLLISIONS
CHEMICAL REACTIONS
COLLISIONS
CROSS SECTIONS
DATA
DEUTERIDES
DEUTERIUM COMPOUNDS
ELEMENTS
EMISSION SPECTROSCOPY
ENERGY DEPENDENCE
ENERGY RANGE
EV RANGE
EV RANGE 01-10
EXCIMER LASERS
EXPERIMENTAL DATA
FLUORESCENCE SPECTROSCOPY
GAS LASERS
HYDROGEN
HYDROGEN COMPOUNDS
HYDROGEN DEUTERIDE
INFORMATION
LASERS
MILLI EV RANGE
MOLECULE COLLISIONS
NONMETALS
NUMERICAL DATA
SPECTROSCOPY
TOTAL CROSS SECTIONS