Accurate frequency of the 119 μm methanol laser from tunable far-infrared absorption spectroscopy

Author

Inguscio, M. ; Zink, L.R. ; Evenson, K.M. ; Jennings, D.A.

Author_Institution

Dipartimento di Sci. Fisiche, Naples Univ., Italy

Volume

26

Issue

3

fYear

1990

fDate

3/1/1990 12:00:00 AM

Firstpage

575

Lastpage

579

Abstract

High-accuracy absorption spectroscopy of CH₃OH in the far infrared is discussed. In addition to 22 transitions in the ground state, the frequency of the (n, τ, J, K), (0, 1, 16, 8)→(0, 2, 15, 7) transition in the ν₅ excited vibrational level, which is responsible for the laser emission at 119 μm, was measured. The measured frequency is 2,522,782.57(10) MHz at zero pressure, with a pressure shift of 6.1(32) kHz/Pa (0.805(420) MHz/torr). An accurate remeasurement of the laser emission frequency has also been performed, and the results are in good agreement

Keywords

frequency measurement; gas lasers; infrared spectra of organic molecules and substances; laser transitions; laser variables measurement; organic compounds; submillimetre wave devices; 119 micron; 2522782.57 MHz; accurate frequency; far infrared; ground state; laser emission; methanol laser; pressure shift; tunable far-infrared absorption spectroscopy; vibrational level; Electromagnetic wave absorption; Frequency measurement; Infrared spectra; Laser excitation; Laser transitions; Methanol; Spectroscopy; Stationary state; Tunable circuits and devices; Vibration measurement;

fLanguage

English

Journal_Title

Quantum Electronics, IEEE Journal of

Publisher

ieee

ISSN

0018-9197

Type

jour

DOI

10.1109/3.52135

Filename

52135