Fourier transform infrared spectroscopy of the NO/sub 3/ nu/sub 2/ and nu/sub 3/ bands: absolute line strength measurements
Journal Article
·
· J. Phys. Chem.; (United States)
The nitrate radical, NO/sub 3/, was produced in a low pressure (<10 Torr) discharge flow reactor and probed by high-resolution (0.005 cm/sup -1/) Fourier transform infrared spectrometry in the regions 730-780, 1020-1090, and 1470-1520 cm/sup -1/. Two infrared bands, consisting of only K/sup 2/ = 3n (n = integer) transitions, have been observed and are assigned, according to D/sub 3h/ symmetry, to the out-of-plane bend (nu/sub 2/) and to the N-O degenerate stretch (nu/sub 3/). Consistent with this assignment is the absence of a symmetric stretching band. Rovibrational constants are derived from the nu/sub 2/ band (nu/sub 0/ = 762.327 cm/sup -1/). Absolute NO/sub 3/ concentrations, derived from measured absorptions of helium-neon laser radiation (632.8 nm), are used in conjunction with the infrared measurements to determine absolute infrared line strengths. Band strengths for nu/sub 2/ and nu/sub 3/ of 26 +/- 19 and 150 +/- 100 cm/sup -2/ atm/sup -1/ are calculated from the observed line strengths. In addition, an upper limit of 2 cm/sup -2/ atm/sup -1/ is obtained for the band strength of the forbidden symmetric stretch (nu/sub 1/). These observed bands are not sufficiently intense to permit infrared detection of NO/sub 3/ in the terrestrial atmosphere using currently available techniques.
- Research Organization:
- California Institute of Technology, Pasadena
- OSTI ID:
- 6510102
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 91:11; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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Wed Feb 08 23:00:00 EST 1989
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Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
500200 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ABSORPTION SPECTROSCOPY
CHALCOGENIDES
DATA
ENERGY LEVELS
EXCITED STATES
EXPERIMENTAL DATA
FOURIER TRANSFORM SPECTROMETERS
INFORMATION
INFRARED SPECTRA
LINE WIDTHS
MEASURING INSTRUMENTS
NITRIC OXIDE
NITROGEN COMPOUNDS
NITROGEN DIOXIDE
NITROGEN OXIDES
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
REACTION INTERMEDIATES
ROTATIONAL STATES
SPECTRA
SPECTROMETERS
SPECTROSCOPY
VIBRATIONAL STATES
400201* -- Chemical & Physicochemical Properties
500200 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ABSORPTION SPECTROSCOPY
CHALCOGENIDES
DATA
ENERGY LEVELS
EXCITED STATES
EXPERIMENTAL DATA
FOURIER TRANSFORM SPECTROMETERS
INFORMATION
INFRARED SPECTRA
LINE WIDTHS
MEASURING INSTRUMENTS
NITRIC OXIDE
NITROGEN COMPOUNDS
NITROGEN DIOXIDE
NITROGEN OXIDES
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
REACTION INTERMEDIATES
ROTATIONAL STATES
SPECTRA
SPECTROMETERS
SPECTROSCOPY
VIBRATIONAL STATES