Collisional electronic quenching of NO A sup 2. Sigma. sup + by N sub 2 from 300 to 4500 K
- Chemistry Department, Williams College, Williamstown, Massachusetts 01267 (United States)
- Combustion Research Facility, Sandia National Laboratories, Livermore, California 94551 (United States)
We report rate coefficients for electronic quenching of NO {ital A} {sup 2}{Sigma}{sup +} {ital v}{prime}=0 by N{sub 2} measured at room temperature and at high temperatures behind reproducible shock waves. The quenching cross section increases from 0.007 A{sup 2} at 300 K to 7 A{sup 2} at 4500 K, and the temperature dependence in the range 300--2300 K is best understood using a charge-transfer (harpoon) collision model. We also record dispersed fluorescence spectra and time-resolved fluorescence from both the directly pumped level ({ital v}{prime}=0) and a collisionally populated level ({ital v}{prime}=1); from these results we obtain rate coefficients for vibrational energy transfer in NO ({ital A}) and electronic quenching of {ital v}{prime}=1 at 1900 K.
- OSTI ID:
- 7029043
- Journal Information:
- Journal of Chemical Physics; (United States), Vol. 97:11; ISSN 0021-9606
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
MOLECULE-MOLECULE COLLISIONS
ENERGY TRANSFER
NITRIC OXIDE
NITROGEN
CROSS SECTIONS
FLUORESCENCE
RELAXATION
SHOCK WAVES
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 0400-1000 K
TEMPERATURE RANGE 1000-4000 K
TEMPERATURE RANGE OVER 4000 K
TIME RESOLUTION
VIBRATIONAL STATES
CHALCOGENIDES
COLLISIONS
ELEMENTS
ENERGY LEVELS
EXCITED STATES
LUMINESCENCE
MOLECULE COLLISIONS
NITROGEN COMPOUNDS
NITROGEN OXIDES
NONMETALS
OXIDES
OXYGEN COMPOUNDS
RESOLUTION
TEMPERATURE RANGE
TIMING PROPERTIES
664300* - Atomic & Molecular Physics- Collision Phenomena- (1992-)