# DIODE LASER MEASUREMENTS OF LINE STRENGTHS IN $\nu_{4}$ OF $METHANE^{*}$

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 Title: DIODE LASER MEASUREMENTS OF LINE STRENGTHS IN $\nu_{4}$ OF $METHANE^{*}$ Creators: Jennings, D. E. Issue Date: 1980 Publisher: Ohio State University Abstract: Diode laser spectra of individual transitions over a wide range of J in $\nu_{4}$ of $^{12}CH_{4}$ have been recorded to determine line strengths for comparison with recent theoretical $tabulations.^{1,2}$ Eleven lines in the range $1202-1317 cm^{-1}$, including RO, R1, and P-branch transitions with J = 7 to 15, were each scanned several times at a variety of sample pressures with high photometric precision. The derived strengths agree remarkable well with those for transitions which have been measured $previously.^{3,4}$ The correspondence with calculated $strengths^{1,2,3}$ is generally good, although the measured values at J$> 10$ are significantly lower than predicted. Techniques for measuring line strengths with a diode laser spectrometer will be discussed. Description: $^{1}$G. S. Orton and A.G. Robiette, submitted to JQSRT (1979). $^{2}$A. Chedin, N. Husson, N.A. Scott, and D. Gautier, J. Mol. Spectrosc. 71, 343 (1978). $^{3}$K. Fox, M.J. Reisfeld, and R.S. McDowell, J. Chem. Phys. 71, 1058 (1979) $^{4}$F.K. Ko and P. Varanasi, JQSRT 18, 145 (1977). $^{*}$Research supported by NASA Planetary Atmospheres Program. Author Institution: URI: http://hdl.handle.net/1811/11456 Other Identifiers: 1980-WF-4