Line Selective Excitation of Ethylene with CO2 Laser Light and Vibrational Relaxation
Conventional I.R. spectroscopy yields for ethylene a very strong absorption band (υ7) in the region of emission of the CO2 laser. High resolution spectroscopy shows however  that most vibro- rotational transitions do not coincide closely with the laser lines, so that strong absorption should not be expected. Nevertheless all CO2 lines may excite ethylene even at low pressure.
KeywordsLaser Line Strong Absorption Band Rotational Transition Vibrational Relaxation Focus Laser Beam
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