Ninety-nine new far infrared (FIR) laser lines from 227 μm to 1.965 mm have been observed in CH 3 CN, CH 3 CCH, CH 3 Cl, CH 3 Br,and CH 3 I by optically pumping these gases with CO 2 -laser pulses of 150-μs duration.
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Chang et al. (1976) studied this question.
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