Title :
Measurement of molecular relaxation rates by IR-FIR double resonance spectroscopy [methanol laser]
Author :
Bakos, Joseph S. ; Mandula, Kálmán ; Sörlei, Zsuzsa
Author_Institution :
Central Res. Inst. for Phys., Budapest, Hungary
fDate :
4/1/1991 12:00:00 AM
Abstract :
It is shown how the rotational and vibrational relaxation rates of molecules, the latter of which limits the efficiency of optically pumped far-infrared lasers, can be measured by infrared-far-infrared double resonance spectroscopy. By measuring the gain line profile and amplitude as a function of the pressures of the laser gas and of additional different buffer gases present in the gain cell, the rate of molecular deexcitation processes can be determined. The results of the measurement of the pressure-broadening coefficients of the methanol 118.8 μm wavelength line caused by collisions with methanol, SF6, and He are presented
Keywords :
gas lasers; infrared spectra of organic molecules and substances; molecular rotational-vibrational energy transfer; organic compounds; 118.8 micron; He; SF6; buffer gases; collisions; gain cell; gain line profile; infrared-far-infrared double resonance spectroscopy; laser gas; methanol; molecular deexcitation processes; molecular relaxation rates; optically pumped far-infrared lasers; pressure-broadening coefficients; pressures; rotational relaxation rates; vibrational relaxation rates; wavelength line; Gas lasers; Laser excitation; Methanol; Optical buffering; Optical pumping; Pump lasers; Resonance; Rotation measurement; Spectroscopy; Vibration measurement;
Journal_Title :
Quantum Electronics, IEEE Journal of
