Carbon Isotope Separation by Multiphoton Dissociation of CF3I

A selective multiphoton dissociation process has been used to enrich carbon-13 in CF3I. A separation factor of nearly 600 has been achieved for irradiation of 0.10 torr of CF3I at -80°C with the R(14) line of the 9.6 μ. CO2laser transition. An investigation of the dependence of the enrichment factor on pressure indicates that collisions during the dissociation are effective in destroying the selectivity. The multiphoton dissociation is quite efficient. At laser intensities of 10 MW/cm2, one in every 11 absorbed photons contributes its energy to the breaking of the C-I bond.

[1]  P. Ewart.  Laser Photochemistry, Tunable Lasers and Other Topics , 1977 .

[2]  S. Mukamel,et al.  Collisionless Multiphoton Dissociation of S F 6 : A Statistical Thermodynamic Process , 1977 .

[3]  P. A. Schulz,et al.  Molecular Beam Study of Multiphoton Dissociation of SF6 , 1977 .

[4]  S. Mukamel,et al.  Multiphoton molecular dissociation in intense laser fields , 1976 .

[5]  E. Grunwald,et al.  Megawatt infrared laser chemistry of chlorotrifluoromethane and trichlorofluoromethane. 1. Photochemistry, photophysics, and effect of hydrogen , 1976 .

[6]  G. Koren,et al.  Deuterium separation in formaldehyde by an intense pulsed CO2 laser , 1976 .

[7]  J. Tiee,et al.  Transient molecular absorptions induced by the absorption of CO2 laser radiation , 1976 .

[8]  N. Bloembergen,et al.  Excitation of polyatomic molecules by radiation , 1976 .

[9]  S. Mukamel,et al.  A model for isotope separation via molecular multiphoton photodissociation , 1976 .

[10]  V. Letokhov,et al.  Laser isotope separation (review) , 1976 .

[11]  J. Lyman,et al.  Enrichment of boron, carbon, and silicon isotopes by multiple‐photon absorption of 10.6‐μm laser radiation , 1976 .

[12]  N. Bloembergen.  Comments on the dissociation of polyatomic molecules by intense 10.6 μm radiation , 1975 .

[13]  H. Jones,et al.  Infrared-microwave double resonance in CF3I; Microwave spectroscopy in emission and absorption☆ , 1975 .

[14]  J. Lyman,et al.  Isotopic enrichment of SF6 in S34 by multiple absorption of CO2 laser radiation , 1975 .

[15]  A. Yogev,et al.  Photochemistry in the electronic ground state. III. Isotope selective decomposition of methylene chloride by pulsed carbon dioxide laser , 1975 .

[16]  S. Freund,et al.  CO2 tea laser-induced photochemical enrichment of boron isotopes , 1975 .

[17]  M. Richardson,et al.  CO2 Laser-Induced Dissociation of SiF4 Molecules into Electronically Excited Fragments , 1973 .

[18]  S. Benson,et al.  Rate constants for radical recombination. III. The trifluoromethyl radical , 1972 .

[19]  G. Burns,et al.  Kinetics of Iodine Atom Recombination between 300 and 1164°K , 1971 .

[20]  N. Basco,et al.  The electronic absorption spectrum of the trifluoromethyl radical , 1971 .

[21]  G. Carlson,et al.  Reaction rate of trifluoromethyl radicals by rapid scan infrared spectroscopy , 1970 .

[22]  P. Ayscough.  Rate of Recombination of Radicals. II. The Rate of Recombination of Trifluoromethyl Radicals , 1956 .

[23]  H. Walther.  Atomic and Molecular Spectroscopy with Lasers , 1976 .

[24]  J. H. Birely,et al.  Experimental and theoretical studies of laser isotope separation , 1976 .

[25]  J. C. Amphlett,et al.  Reactions of trifluoromethyl radicals with bromine, chlorine and hydrogen chloride , 1966 .