Identification of forbidden transitions in the nu 4 band of 14NH3 by intracavity laser-Stark spectroscopy
Abstract
These transitions are forbidden in the sense that they follow the selection rule delta K = + or - 2, which violates the usual rule that delta K = + or - 1 for a perpendicular band of a symmetric top, where K is the projection of the total angular momentum onto the molecular symmetry axis. The assignments are based for the most part on laser-Stark measurements made with a CO laser and an intracavity Stark cell. The procedure followed in making the assignments is described. Attention is called to the significance of these new lines in the analysis of the nu-4 vibrational state and in an improved determination of the ground-state rotational and centrifugal distortion constants.
- Publication:
-
Optics Letters
- Pub Date:
- September 1983
- DOI:
- 10.1364/OL.8.000488
- Bibcode:
- 1983OptL....8..488W
- Keywords:
-
- Ammonia;
- Forbidden Transitions;
- Laser Spectroscopy;
- Molecular Energy Levels;
- Stark Effect;
- Vibrational Spectra;
- Ground State;
- Molecular Orbitals;
- Molecular Rotation;
- Orbit Perturbation;
- Atomic and Molecular Physics