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Formation and quenching of metastable N/sub 2/A/sup 3/. sigma. /sub u//sup +/ in the electronic relaxation of NO C/sup 2/PI and D/sup 2/. sigma. /sup +/ in an NO/N/sub 2/ mixture

Journal Article · · J. Phys. Chem.; (United States)
DOI:https://doi.org/10.1021/j150652a002· OSTI ID:6441580
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Time-resolved experiments are carried out to elucidate the electronic relaxation mechanism of NO C/sup 2/PI (or D/sup 2/..sigma../sup +/) + N/sub 2/ ..-->.. NO A/sup 2/..sigma../sup +/ + N/sub 2/, following the selective SVL excitation by two-photon absorption. The fluorescence intensity-time profiles of NO A/sup 2/..sigma../sup +/ formed collisionally show that the relaxation involves metastable N/sub 2/A/sup 3/..sigma../sub u//sup +/ as an intermediate in the energy transfer sequence of NO C/sup 2/PI (or D/sup 2/..sigma../sup +/) + N/sub 2/X..sigma../sub g//sup +/ ..-->.. NO X/sup 2/PI + N/sub 2/A/sup 3/..sigma../sub u//sup +/(1) and N/sub 2/A/sup 3/..sigma../sub u//sup +/ + NO X/sup 2/PI ..-->.. N/sub 2/X/sup 1/..sigma../sub g//sup +/ + NO A/sup 2/..sigma../sup +/ (2). The second energy transfer (process 2) rate controls the NO A/sup 2/..sigma../sup +/ fluorescence decay measured in NO/N/sub 2/ mixtures. The quenching rate constant of N/sub 2/AElt. slash/sub u//sup +/ by NO in the ground state has been determined to be (6.9 +- 0.7) x 10/sup -11/ cm/sup 3/ molecule/sup -1/ s/sup -1/ at 298 +- 3 K.

Research Organization:
Tokyo Inst. of Tech., Ohokayama, Japan
OSTI ID:
6441580
Journal Information:
J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 88:8; ISSN JPCHA
Country of Publication:
United States
Language:
English

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Related Subjects

550200* -- Biochemistry
59 BASIC BIOLOGICAL SCIENCES
CHALCOGENIDES
DATA
DE-EXCITATION
DISPERSIONS
ELEMENTS
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITED STATES
EXPERIMENTAL DATA
FLUORESCENCE
INFORMATION
KINETICS
LUMINESCENCE
MIXTURES
NITROGEN
NITROGEN COMPOUNDS
NITROGEN OXIDES
NITROUS OXIDE
NONMETALS
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
REACTION KINETICS
RELAXATION