Fourier transform infrared emission spectra of MgH and MgD
Abstract
High resolution Fourier transform infrared emission spectra of MgH and MgD have been recorded. The molecules were generated in an emission source that combines an electrical discharge with a high temperature furnace. Several vibration-rotation bands were observed for all six isotopomers in the X 2Σ+ ground electronic state: v=1→0 to 4→3 for 24MgH, v=1→0 to 3→2 for 25MgH and 26MgH, v=1→0 to 5→4 for 24MgD, v=1→0 to 4→3 for 25MgD and 26MgD. The new data were combined with the previous ground state data, obtained from diode laser vibration-rotation measurements and pure rotation spectra, and spectroscopic constants were determined for the v=0 to 4 levels of 24MgH and the v=0 to 5 levels of 24MgD. In addition, Dunham constants and Born-Oppenheimer breakdown correction parameters were obtained in a combined fit of the six isotopomers. The equilibrium vibrational constants (ωe) for 24MgH and 24MgD were found to be 1492.776(7) cm-1 and 1077.298(5) cm-1, respectively, while the equilibrium rotational constants (Be) are 5.825 523(8) cm-1 and 3.034 344(4) cm-1. The associated equilibrium bond distances (re) were determined to be 1.729 721(1) Å for 24MgH and 1.729 157(1) Å for 24MgD.
- Publication:
-
Journal of Chemical Physics
- Pub Date:
- June 2004
- DOI:
- 10.1063/1.1724821
- Bibcode:
- 2004JChPh.12010002S
- Keywords:
-
- 33.20.Ea;
- 33.15.Mt;
- 33.20.Sn;
- 33.20.Tp;
- 33.15.Dj;
- 33.15.Hp;
- Infrared spectra;
- Rotation vibration and vibration-rotation constants;
- Rotational analysis;
- Vibrational analysis;
- Interatomic distances and angles;
- Barrier heights