Effect of pressure and pulse length on the isotopically selective photodissociation of freon CF2Cl2 under CO2 laser pulses

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Abstract
When the 13C species of CF2Cl2 is excited by short TEA‐CO2 laser pulses, the isotopic enrichment of the resultant photodissociation remains constant between 0.25 and 2 Torr CF2Cl2 pressure, whereas excitation of the 12C species yields a monotonous decrease of the enrichment with pressure in the same range. These results are compared to those obtained with longer pulses and with the 32S and 34S species of SF6.