The ν2 + ν4 band of 12CF 4
Abstract
From a high-resolution diode laser spectrum of cooled 12CF 4, line assignments in ν2 + ν4 at 1066.4 cm -1 have been made for tetrahedral subspecies to J = 20, and in many cases to higher J. Spectroscopic constants have been obtained from a least-squares fit of the Hamiltonian, and the relative intensities of the assigned lines have been calculated. The ground- and excited-state rotational constants, Coriolis constant, and splitting of the F1 and F2 vibrational substates have the values a.The CF bond length in the ground vibrational state is thus r 0 = 1.31752 ± 0.00007 Å. The analysis of a combination band such as this provides a method of obtaining ground-state spectroscopic constants of spherical-top molecules directly from the infrared spectrum, without the necessity of measuring weak "forbidden" transitions. The assignments allow accurate predictions of the frequencies emitted by the CO 2-pumped CF 4 laser.
- Publication:
-
Journal of Molecular Spectroscopy
- Pub Date:
- March 1980
- DOI:
- 10.1016/0022-2852(80)90271-4
- Bibcode:
- 1980JMoSp..80...71P