The calculation is based on a combined fit of rotational and rovibrational data of CaH. The higher N v = 0 as well as the v = 1 rotational data were reported by
(1) J. Furuta, K. Kobayashi, F. Matsushima, Y. Moriwaki, H. Ozeki, and S. C. Ross, 2025, Chem. Phys. Lett. 869, Art. No. 142019.
The v = 0, N = 1 – 0 lines were taken from
(2) J. Barclay, M. A. Anderson, and L. M. Ziurys, 1993, Astrophys. J. 408, L65.
The v = 0, N = 2 – 1 lines were taken from
(3) C. I. Frum, J. J. Oh, E. A. Cohen, H. M. Pickett, 1993, Astrophys. J. 408, L61.
The rovibrational data were published by
(4) A. Shayesteh, K. A. Walker, I. Gordon, D. R. T. Appadoo, and P. F. Bernath, 2004, J. Mol. Struct. 695, 23.
Initial mechanical and fine structure parameters were largely taken from
(5) A. Shayesteh, R. S. Ram, and P. F. Bernath, 2013, J. Mol. Spetrosc. 288, 46;
several higher order parameters were kept fixed to the initial values. Hyperfine structure parameters were derived from (1).
The calculation should be accurate enough to 4 THz, caution is advised for higher frequencies.
The dipole moment was estimated from an experimental value of CaD determined in
(6) J. Chen and T. C. Steimle, 2008, J. Chem. Phys. 128, Art. No. 144312.