Abstract
New Fourier transform measurements for the A(2)Pi - X-2 Sigma(+) system of BeH are combined with previously published A - X data for BeH, BeD, and BeT, with existing data for the C-2 Sigma(+) - X-2 Sigma(+) system, and with recent vibration-rotation data for BeH and BeD, and fitted using combined-isotopologue Dunham expansion and direct-potential-fit methods. This data set provides direct spectroscopic information spanning 95% of the ground X-2 Sigma(+) state potential well, and provides the most comprehensive spectroscopic description of this state reported to date. The analysis of this data set allows us to study the breakdown of the Born-Oppenheimer approximation for a metal hydride from the minimum of the potential well to near the dissociation limit. Improved molecular constants are also determined for the A(2)Pi nand C-2 Sigma(+) states. (C) 2006 Elsevier Inc. All rights reserved.
| Original language | English |
|---|---|
| Pages (from-to) | 178-188 |
| Number of pages | 11 |
| Journal | JOURNAL OF MOLECULAR SPECTROSCOPY |
| Volume | 236 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - Apr 2006 |
Keywords
- metal hydride
- Born-Oppenheimer breakdown
- Fourier transform emission spectroscopy
- BeH
- direct potential fit
- TRANSFORM EMISSION-SPECTROSCOPY
- DIATOMIC-MOLECULES
- POTENTIAL-ENERGY
- RYDBERG STATES
- SPECTRA
- A2PI-X2SIGMA
- ABSORPTION
- TRANSITION
- BARRIER
- SYSTEM