Abstract
In a search for the infrared spectra of gaseous CaH2 and SrH2, 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 (CaH)-Ca-40 and (SrH)-Sr-88, and the v = 1 --> 0 band of (SrH)-Sr-87 and (SrH)-Sr-86 were observed in the X-2-->Sigma(+) 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 (CaH)-Ca-40 and 8 8 SrH 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 (omega(c)) for CaH and SrH were found to be 1298.400(1) and 1207.035(1) cm(-1), respectively, while the equilibrium rotational constants (B-c) are 4.277043(4) and 3.673495(4) cm(-1). The equilibrium bond distances (r(c)) were determined to be 2.0023603(9) Angstrom for CaH and 2.1460574(10) Angstrom for SrH. (C) 2004 Elsevier B.V. All rights reserved.
| Original language | English |
|---|---|
| Pages (from-to) | 23-37 |
| Number of pages | 15 |
| Journal | JOURNAL OF MOLECULAR STRUCTURE |
| Volume | 695 |
| DOIs | |
| Publication status | Published - 30 Jun 2004 |
Keywords
- vibration -rotation emission spectrums
- CaH and SrH
- equilibrium molecular constants
- Born-Oppenheimer breakdown constants
- ULTRAVIOLET-ABSORPTION SPECTRUM
- ULTRA-VIOLET REGION
- DIODE-LASER SPECTROSCOPY
- LYING ELECTRONIC STATES
- X BAND SYSTEMS
- ROTATIONAL ANALYSIS
- CALCIUM HYDRIDE
- GROUND-STATE
- A-X
- UV REGION