THE NO VIBRATIONAL FUNDAMENTAL BAND: $O_{2}$-BROADENING COEFFICIENTS

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1997

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Ohio State University

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Rovibrational spectra of the vibrational fundamental of nitric oxide at $1875 cm^{-1}$ have been recorded under $O_{2}$-broadening conditions at 296 K and $0.0056 cm^{-1}$ resolution using the Solar McMath FTS at the Kitt Peak National Observatory. The use of a flow system,. Which maintains the $NO_{2}$ at trace levels, has enabled the first measurement of these broadening coefficients. The broadening of the trace contaminant, $N_{2}O$, allowed checks of the measured pressures. The least-squared analysis of the spectral includes the nuclear hyperfine structure in addition to $\lambda$ doubling. We observed differential broadening between the e and f $\lambda$ components of ${^{2}} \Pi_{1/2}$ transitions as will as larger differences in broadening observed between respectively the ${^{2}} \Pi_{1/2}$ and ${^{2}} \Pi_{3/2}$ transitions.

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Author Institution: NASA Ames Research Center; Jet Propulsion Laboratory, California institute of Technology

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