Seventy-eight absorption lines, located in an extremely crowded portion of the CH3OH spectrum, have been measured with a tunable coherent FIR spectrometer, based on third order mixing in a point contact diode. The high experimental resolution (20 kHz) allows the separation of overlapping lines observed with a Fourier transform spectrometer. Comparisons with previous Fourier transform measurements and theoretical predictions are presented. A separate measurement reveals that the 170 μm laser line of CH3OH is very close to a strong absorption line, possibly explaining the peculiar Stark behavior of the laser line and a large reported apparent pressure shift.
Ultrahigh resolution far-infrared spectroscopy of methanol / G. Moruzzi;M. Prevedelli;K.M. Evenson;D.A. Jennings;M.D. Vanek;M. Inguscio. - In: INFRARED PHYSICS. - ISSN 0020-0891. - STAMPA. - 29:(1989), pp. 541-549. [10.1016/0020-0891(89)90097-3]
Ultrahigh resolution far-infrared spectroscopy of methanol
PREVEDELLI, MARCO;INGUSCIO, MASSIMO
1989
Abstract
Seventy-eight absorption lines, located in an extremely crowded portion of the CH3OH spectrum, have been measured with a tunable coherent FIR spectrometer, based on third order mixing in a point contact diode. The high experimental resolution (20 kHz) allows the separation of overlapping lines observed with a Fourier transform spectrometer. Comparisons with previous Fourier transform measurements and theoretical predictions are presented. A separate measurement reveals that the 170 μm laser line of CH3OH is very close to a strong absorption line, possibly explaining the peculiar Stark behavior of the laser line and a large reported apparent pressure shift.
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