Line intensities in the ν5 band of acetylene 12C 2H 2

Abstract

Using FTS spectra (apodized FWHM: 0.0014 cm −1) , absolute intensities have been measured for about 80 lines of the ν 5 band of 12C 2H 2 at 13.6 μm , with an accuracy of ±5%, improving the already published measured values. The vibrational transition dipole moment squared has been determined: |R 0| 2=(9.81±0.11)×10 −2 D 2 (1 D=3.33546×10 −30 C m), as also the Herman–Wallis coefficients: A 1 RP =(−9.34±1.85)×10 −4, and A 2 RP =(4.30±0.89)×10 −5. On the whole, the measured line intensities have been found greater than the 1996 HITRAN values by about 14%.