The (1,0,0,0) state undergoes anharmonic, non-resonant interaction with the (0,0,2,0), (0,0,0,4), and (0,1,0,1) states. Moreover, the latter two states are in resonant interaction. The interactions among these states have been analyzed for the first time by
(1) K. M. T. Yamada and R. A. Creswell, 1986 J. Mol. Spectrosc. 116, 384.
A considerable amount of transition frequencies were taken from that work. Additional data were taken from
(2) L. Mbosei, A. Fayt, P. Dréan, and J. Cosléou, 2000, J. Mol. Struct. 517-518, 271.
Additional data for v₄ = 1 were reported by
(3) S. Thorwirth, H. S. P. Müller, and G. Winnewisser, 2000, J. Mol. Spectrosc. 204, 133;
and by
(4) P. D. Mallinson and R. L. de Zafra, 1978, Mol. Phys. 36, 827.
The present analysis follows largely (1); some additional parameters were estimated from the data in (3). The ν₄ band origin has not been determined with accuracy. An estimate was taken from
(5) P. D. Mallinson and A. Fayt, 1976, Mol. Phys. 32, 473.
The 2 ν₆ and ν₅ + ν₇ band origins were derived from
(6) E. Arie, Dang Nhu M., Ph. Arcas, G. Graner, H. Bürger, G. Pawelke, M. Khilfi, and F. Raulin, 1990, J. Mol. Spectrosc. 143, 318.
Possible rotational (Coriolis-type) interaction of (0,0,1,2) with (0,0,2,0) or with (0,0,0,4) has been neglected in the present analysis. The redundant state number has been omitted. Transition frequencies with uncertainties larger than 100 kHz have not been merged.
The predictions may be reliable throughout.
Note: The partition function does not include any vibrational corrections. However, vibrational contributions to the partition function of HC₃N are available.
The dipole moments were estimated or derived from those of the (0,0,0,0), (0,0,0,1), and (0,0,1,0) states.