Abstract
In a search for the infrared spectra of gaseous CaH 2 and SrH 2, we obtained new Fourier transform infrared emission spectra of CaH and SrH, but no evidence of the metal dihydrides. The vibration-rotation bands from v=1→0 to v=4→3 of 40CaH and 88SrH, and the v=1→0 band of 87SrH and 86SrH were observed in the X 2 Σ + ground electronic states. The new data were combined with the previous ground state data, obtained from diode laser infrared and pure rotational spectra, and the spectroscopic constants for v=0 to 4 of 40CaH and 88SrH were determined. In addition, the Dunham constants and the Born–Oppenheimer breakdown correction parameters were obtained using the previous ground state data for CaD and SrD in combined isotopomer fits. The equilibrium vibrational constants ( ω e) for CaH and SrH were found to be 1298.400(1) and 1207.035(1) cm −1, respectively, while the equilibrium rotational constants ( B e) are 4.277043(4) and 3.673495(4) cm −1. The equilibrium bond distances ( r e) were determined to be 2.0023603(9) Å for CaH and 2.1460574(10) Å for SrH.
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