Abstract
A selective multiphoton photochemical process has been used to enrich nitrogen-14 isotope in methylamine. A separation factor of 2 has been achieved for irradiation of CH3N14H2/CH3N15H2/NO sample with the P (24) line of the 9.6-μ CO2 laser transition. The threshold laser energy fluence for reaction is roughly 30 J/cm2. The vibrational isotope shift of methylamine at the 9.6-μ region was found to be 12.5 cm−1. The selectivity of the photochemical reaction appears to be limited by the overlap of vibrational-rotational lines of CH3N14H2 and CH3N15H2 molecules due to power broadening under the intense laser field.
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