# LINE STRENGHS OF THE $\nu_{2}$ AND $\nu_{4}$ BANDS OF METHANE

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 Title: LINE STRENGHS OF THE $\nu_{2}$ AND $\nu_{4}$ BANDS OF METHANE Creators: Loete, M.; Hilico, J. C.; Brown, L. R. Issue Date: 1987 Abstract: Absolute line strengths of the $\nu_{z}$ and $\nu_{4}$ bands of $^{12}CH_{4}$ in the $1000-1800 cm^{-1}$ region have been measured from high resolution spectra recorded on the F. T. spectrometer at Kitt Peak. 871 well isolated lines of these two bands, up to $J = 21$, have been selected and analyzed simultaneously in a dyad scheme (548 lines for $\nu_{4}$ and 323 lines for $\nu_{z}$). This analysis has required a second order dipole moment development involving 7 parameters. The relative standard deviation is around 3 \%, in agreement with the experimental precision. It will be shown that individual deviations are evenly distributed in the two bands and between allowed and forbidden lines. The complete spectrum up to $J = 23$ has been calculated including about 11 500 lines. The overall sum of line strengths has been calculated to be $127 cm^{-2} atm^{-1}$ at 296 K. Preliminary results for the strengths of the $\nu_{z}$ and $\nu_{4}$ bands of $^{13}CH_{4}$ will be also presented. URI: http://hdl.handle.net/1811/17159 Other Identifiers: 1987-FB-14