Abstract
The vibration-rotation spectrum of 13C mono-substituted acetylene, 12C13CH2, has been recorded in the region between 1100 and 3500 cm−1 at instrumental (4 × 10−3 cm−1) or Doppler limited (6–8 × 10−3cm−1) resolution. Hot and cold bands involving the stretchings v1, v2 and v3 and the stretching-bending combination bands with ν2 = 1, ν4 ⩽ 1 and ν5 ⩽ 2 have been observed and analysed. The anharmonic resonances within the dyads ν1/(v2 + 2ν5) and ν3/(ν2 + ν4 +ν5), which strongly perturb the spectrum of 13C2H2 and 12C2H2, respectively, have been analysed. From the simultaneous treatment of all the assigned transitions a set of deperturbed molecular parameters, containing also the coupling coefficients K1,255 and K3,245, was derived. They fully characterize the ro-Vibrational pattern of the observed stretching and stretching-bending combination states and provide an accurate description of the anharmonic resonances in the molecule.
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