|Author||Bethardy, G. A. ♦ Perry, D. S.|
|Source||United States Department of Energy Office of Scientific and Technical Information|
|Subject Keyword||PHYSICS ♦ MOLECULES ♦ ABSORPTION SPECTROSCOPY ♦ FREQUENCY MODULATION ♦ LASER RADIATION ♦ JETS ♦ ACETYLENE ♦ RESOLUTION|
|Abstract||A device for high-resolution frequency-modulated absorption spectroscopy of jet-cooled molecules is described and demonstrated. Direct absorption spectra of jet-cooled molecules are recorded by multipassing an infrared laser beam through a free-jet expansion with all light rays perpendicular to the nozzle axis. In sliced-jet spectroscopy sub-Doppler resolution is obtained by inserting a small blade upstream from the laser crossing to obstruct molecules that would otherwise absorb at the center of the Doppler profile. Here the sliced-jet technique is extended by replacing the blade by a stainless-steel string vibrating at a frequency of about 10 kHz. Phase sensitive detection of the frequency-modulated absorption signal is accomplished with a lock-in amplifier. A resolution of 12 MHz is demonstrated using the modulated sliced-jet technique.|
|Learning Resource Type||Article|
|Publisher Place||United States|
|Journal||Review of Scientific Instruments|
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