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)
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
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