High-Resolution Spectroscopy of CH318OH: Stark Behavior of FIR Laser Lines

✍ Scribed by G. Carelli; A. Moretti; F. Strumia; S. Zhao; R.M. Lees

• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 238 KB
• Volume: 177
• Category: Article
• ISSN: 0022-2852
• DOI: 10.1006/jmsp.1996.0120

✦ Synopsis

We report the Stark behavior of 31 FIR laser lines of CH 3 18 OH optically pumped by a CO 2 waveguide laser. We observe various behaviors for different laser lines: power decrease, power enhancement, shifting and splitting of the laser lines, or no effect at all. Since the observed Stark line shapes depend critically on the quantum numbers of the molecular levels involved in the laser cycle, we used the Stark effect to test many of the known assignments of FIR laser lines of CH 3 18 OH. Nineteen previous assignments were confirmed and a new one is proposed. Two new laser lines are also reported and characterized in wavelength, offset and polarization. The linear Stark shifts were calculated including both the usual first-order m a -type terms and the m b -type contributions arising from the mixing of Stark and molecular asymmetry terms. This second term is incorporated in the calculations by writing m(n, t, K, J) Å m a S b (n, t, K, J), where S b (n, t, K, J) is a state-dependent scaling factor close to unity.