Energy Transfer Reactions of Atmospheric Interest.
Final rept. 1 Jan 74-31 Dec 76,
STANFORD RESEARCH INST MENLO PARK CALIF MOLECULAR PHYSICS CENTER
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Three main areas have been investigated during the term of this contract 1 The kinetics of the sources and sinks of O1S in the lower thermosphere have been studied. Measurements have been made of the temperature-dependent rate of the reaction O1S O3P goes to 20. The production of O1S in an oxygen atom system has been investigated, and comparisons have been made between the so-called Barth mechanism, in which O1S is produced from ground state atoms in a two-step process, and the one-step Chapman mechanism. The temperature dependence of this O1S source term has been obtained. On the basis of atmospheric observations, the conclusion is drawn that a better correlation exists between measured oxygen atom concentration profiles and the laboratory data if the source of O1S in the nightglow is the Barth, rather than the Chapman, mechanism. 2 A determination of quenching rate coefficients for the NOB2 pI state has been made, using a variety of collision partners. This state, the source of the NO B-band system, is important in combustion processes. 3 The first measurements of the product channels in O1S reactions have been carried out, using the five collision partners N2O, H2O, CO2, O2, and NO. All the reactions give high yields of physical quenching, with only H2O and possibly N2O having significant chemical reaction pathways--50 in the former case, and either 25 or 65 in the latter. Several of these reactions are of practical importance, and the behavior of a system having two alternatives for a physical quenching step O3P or OD is also interesting from a theoretical standpoint. Author
- Atmospheric Physics
- Atomic and Molecular Physics and Spectroscopy