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  • 11
    Electronic Resource
    Electronic Resource
    IR absorption of highly vibrationally excited SF6 (1978)
    Springer
    Applied physics 15 (1978), S. 297-301 
    Details
    ISSN: 1432-0630
    Keywords: 33
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract In a double-resonance experiment, the absorption of various CO2 laser lines by sulfur hexafluoride was measured, before and after the SF6 was pumped by a fixed frequency CO2 laser to a level of 5 quanta/molecule. The absorption is substantially shifted to longer wavelengths. But the short wavelength wing of the absorption band is not completely bleached. Instead a shoulder of several cm−1 width is left. This shoulder is probably important for the explanation of the infrared laser induced dissociation of SF6.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00896111
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  • 12
    Electronic Resource
    Electronic Resource
    IR multiphoton absorption and isotopically selective dissociation of CHCIF2 in a herriott multipass cell (1994)
    Springer
    The European physical journal 29 (1994), S. 291-298 
    Details
    ISSN: 1434-6079
    Keywords: 82.50.−m
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The small absorption is a major problem in isotopically selective IR multiphoton dissociation. Usually the radiation diverges before it is fully absorbed. To solve this problem, we have demonstrated the application of a refocusing (Herriott) multipass cell. It can generally help in laser isotope separation to use the photons more efficiently. Employing such a cell and a Q-switched CO2 laser at high repetition rate, the dissociation yield of CHCIF2 was 23 times higher than in a single pass. The number of passes used (up to 60) was more than is conventionally possible in such small cells. The increased number was permitted by making use of spherical aberration. With 18 passes, we also measured the multiphoton absorption for various wavelengths and pressures, in part separately for12CHCIF2 and13CHCIF2, and also for two-wavelength irradiation. Appropriate change of pressure or wavelength increased the absorption. But the corresponding increase of the dissociation was larger in every case. To explain this and other observations, we invoke the molecular distribution over the energy levels.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01437848
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  • 13
    Electronic Resource
    Electronic Resource
    Isotope selective dissociation of CHClF2 by a one- and two-wavelengthQ-switched CO2 laser (1992)
    Springer
    The European physical journal 24 (1992), S. 47-56 
    Details
    ISSN: 1434-6079
    Keywords: 82.50. − m
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: 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.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01436603
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    Paper (German National Licenses)
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