Absolute intensities and foreign gas broadening coefficients of the 111,10←112,10 and 180,18←181,18 lines in the ν7 band of C2H4.

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Scientific paper

Absolute intensities and foreign gas broadening coefficients of the 180,18←181,18 and 111,10←112,10 transitions in the ν7 band of C2H4 near 948 cm-1 have been measured at a spectral resolution of ≡5×10-4cm-1 using tunable diode laser spectrometry. Ar, He, N2, and O2 were used as the broadening gases. In order to determine the temperature dependence of the broadening coefficient, data were obtained at temperatures ranging from 150 to 296K. The absolute intensity of the 50,5←51,5 transition was also found at 296K. A band strength of 339±10 cm-2atm-1 was obtained from weighted averages of the individual line intensities and a rigid asymmetric top calculation.

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