Integrated Intensities of the Main Absorption Band of С2HD in the 6530–6627 cm–1 Region

We measured the integral intensities of the rotational lines of the C₂HD molecule in the band of the first overtone (2, 0, 0, 0, 0) and the combination tone (1, 0, 1, 0, 1) in the range of P(3)–P(17) and R(0)‒R(33). For the (2, 0, 0, 0, 0) overtone, the usual distribution of intensities along the lines of the P- and R-branches is observed. For the combination tone (1, 0, 1, 0, 1), a non-standard intensity distribution is observed, which has a sharp dip at J < 6 for both the P- and R-branches. This phenomenon is explained by the drawing of intensity from the overtone (2, 0, 0, 0, 0) by the combination tone due to intramolecular Coriolis interaction. At small J, the Coriolis interaction becomes insufficient for effective mixing of states and the effect of intensity drawing disappears.