# AIR-BROADENED HALFWIDTHS AND PRESSURE SHIFTS IN THE $\nu_{3}$ BAND OF $^{13}CH_{4}$

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 Title: AIR-BROADENED HALFWIDTHS AND PRESSURE SHIFTS IN THE $\nu_{3}$ BAND OF $^{13}CH_{4}$ Creators: Devi, V. Malathy; Smith, M. A. H.; Benner, D. Chris; Rinsland, C. P. Issue Date: 1988 Publisher: Ohio State University Abstract: High-resolution $(0.01 cm^{-1})$ room-temperature spectra of 13CH4 diluted with dry air were obtained in the $2700-3200 cm^{-1}$ spectral region using the McMath Fourier transform spectrometer at the National Solar Observatory on Kitt Peak. A 99\% 13C-enriched methane diluted to a mixing ration of approximately 0.01 was used in a 5 cm absorption path to record the data. The total sample pressures used were approximately 75, 150, 300 and 500 Torr. A nonlinear least-squares spectral fitting technique was ued in determining the halfwidth coefficients and positions. The derived halfwidth coefficients and pressure shifts will be compared to vales obtained for identical transitions in the $\nu_{3}$ band of $^{12}CH_{4}$ as well as to those in the $\nu_{4}$ band of $^{13}CH_{4}$. Description: Author Institution: Department of Physics, College of William and Mary; Atmospheric Sciences Division, Mail stop 401A, NASA Langley Research Center; Department of Physics, College of William and Mary URI: http://hdl.handle.net/1811/17608 Other Identifiers: 1988-RF-7