PHOTOLYTIC SEPARATION OF ISOTOPES IN CRYOGENIC SOLUTION

摘要

PHOTOLYTIC SEPARATION OF ISOTOPES IN CRYOGENIC SOLUTION Separation of carbon isotopes by photolysis of CS2 in cryogenic solutions of nitrogen, krypton and argon with 206 nm light from an iodine resonance lamp is reported. The spectral distribution of the ultraviolet absorption depends on solvent. Thus, in liquid nitrogen the photolytic decomposition rate of 13CS2 is greater than that of 12CS2 (because the absorption of 206 nm radiation is greater for 13CS2), whereas in liquid krypton and liquid argon the reverse is true. The shift in ultraviolet spectrum is a general phenomenon readily characterized as a function of solvent polarizability, and exhibits behavior similar to that for vibrational transitions occurring in the infrared.