The lines were measured by
(1) T. C. Steimle, S. Saito, and S. Takano 1993, Astrophys. J. 410, L49; and
(2) C. T. Scurlock, T. C. Steimle, and R. D. Suenram 1994, J. Phys. Chem. 100, 3497;
The dipole moment was measured by
(3) T. C. Steimle, D. A. Fletcher, K. Y. Yung, and C. T. Scurlock, 1992, J. Chem. Phys. 97, 2909.
The molecule is quasi-linear and thus very floppy. Therefore, predicted frequencies beyond 371 GHz should be viewed cautiously.