Energy disposal in the vibrational-state- and bond-selected reaction of water with hydrogen atoms

Journal Article · Thu Oct 17 04:00:00 EDT 1991 · Journal of Physical Chemistry; (United States)

DOI:https://doi.org/10.1021/j100174a046· OSTI ID:7017354

Hsiao, M C; Sinha, A; Crim, F F ^[1]

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1. Univ. of Wisconsin, Madison (United States)

The importance of the reaction of water and hydrogen atoms to atmospheric and combustion processes has motivated both theoretical and experimental studies of its dynamics. The measured OH product state distribution from the reaction of vibrationally excited water with thermal hydrogen atoms supports an intuitive picture of selective disposal in this reaction. Excitation of the third overtone of the O-H stretch (4v{sub OH}) in either water or HOD provides enough energy to initiate the reaction, and laser-induced fluorescence (LIF) monitors the state populations of the reaction product OH or OD. The internal energy of the detected product is small compared to the roughly 9,000 cm{sup {minus}1} of available energy. The average rotational and vibrational energies of OH produced from reaction of H{sub 2}O(4v{sub OH}) are 320 {plus minus} 10 and 100 {plus minus} 30 cm{sup {minus}1}. The reaction of HOD(4v{sub OH}) produces OD with average rotational and vibrational energies of 190 {plus minus} 10 and 440 {plus minus} 90 cm{sup {minus}1}. Analysis of Doppler profiles in the LIF excitation spectra shows that the energy in relative translation of the products is no more than 5,000 cm{sup {minus}1}, leaving the substantial balance of available energy in the H{sub 2} product, most likely as vibrational excitation.

• OSTI ID: 7017354
• Journal Information: Journal of Physical Chemistry; (United States), Journal Name: Journal of Physical Chemistry; (United States) Vol. 95:21; ISSN 0022-3654; ISSN JPCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
400800 -- Combustion
Pyrolysis
& High-Temperature Chemistry
CHEMICAL REACTIONS
DATA
DEUTERIUM COMPOUNDS
DOPPLER EFFECT
ELEMENTS
EMISSION SPECTROSCOPY
ENERGY LEVELS
EXCITED STATES
EXPERIMENTAL DATA
FLUORESCENCE SPECTROSCOPY
HYDROGEN
HYDROGEN COMPOUNDS
INFORMATION
ISOTOPE EFFECTS
NONMETALS
NUMERICAL DATA
OXYGEN COMPOUNDS
ROTATIONAL STATES
SPECTROSCOPY
VIBRATIONAL STATES
WATER