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