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
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), Vol. 91:21
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
74 ATOMIC AND MOLECULAR PHYSICS
DEUTERIUM COMPOUNDS
CHEMICAL REACTIONS
HYDROGEN
HYDROGEN DEUTERIDE
ATOM-MOLECULE COLLISIONS
ENERGY DEPENDENCE
EV RANGE 01-10
EXCIMER LASERS
EXPERIMENTAL DATA
FLUORESCENCE SPECTROSCOPY
MILLI EV RANGE
TOTAL CROSS SECTIONS
ATOM COLLISIONS
COLLISIONS
CROSS SECTIONS
DATA
DEUTERIDES
ELEMENTS
EMISSION SPECTROSCOPY
ENERGY RANGE
EV RANGE
GAS LASERS
HYDROGEN COMPOUNDS
INFORMATION
LASERS
MOLECULE COLLISIONS
NONMETALS
NUMERICAL DATA
SPECTROSCOPY
400202* - Isotope Effects
Isotope Exchange
& Isotope Separation
640304 - Atomic
Molecular & Chemical Physics- Collision Phenomena