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Isotope selective dissociation of CHClF2 by a one- and two-wavelengthQ-switched CO2 laser

Research paper by W. Fuß, J. Göthel, M. Ivanenko, K. L. Kompa, W. E. Schmid

Indexed on: 01 Mar '92Published on: 01 Mar '92Published in: Zeitschrift für Physik D Atoms, Molecules and Clusters



Abstract

13C isotope separation by multiphoton dissociation of CHClF2 was studied by a continuous-discharge CO2 laserQ-switched at 8 kHz. This laser can easily emit two or more wavelengths with good spatial and temporal overlap. The best irradiation results were obtained by the line pair 9P16 + 9P28. After optimizing also the pressures of CHClF2 and of buffer gases (He and Ar), the energy density and the gas speed, the process is now much less nonlinear than in previous experiments with a single wavelength. Differences to the TEA laser induced process were observed, and generally the pressure influence on yield and selectivity showed a variety of phenomena. They were interpreted in terms of collisional changes of spectra during the laser pulse.