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  • 35  (3)
  • 82.50.−m  (1)
  • Chemistry  (1)
  • Organic Chemistry  (1)
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  • 1
    Digitale Medien
    Digitale Medien
    Multiphoton absorption of broad-band CO2 laser radiation by SF6 (1984)
    Springer
    Applied physics 35 (1984), S. 1-5 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 82.50 ; 33 ; 35
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Increase of the emission bandwidth of a high-pressure CO2 laser up to 1.5 cm−1 increases the multiphoton absorption cross-section of SF6. Comparison with the previously found [9] increased absorption for shorter pulses suggests that this is also a bandwidth effect. Spectral structures as narrow as 1 cm−1 above the 10th absorption step are invoked to explain the observations. The temperature effect, which disappears in the broad-band case, confirms this view.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00697513
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  • 2
    Digitale Medien
    Digitale Medien
    Improved separation of the rare sulfur isotopes by infrared multiphoton dissociation of SF6 (1987)
    Springer
    Applied physics 42 (1987), S. 147-153 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 82.50 ; 33 ; 35
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The dissociation probabilities of32SF6 and some of34SF6 have been measured at a large number of CO2 laser lines both at room temperature and at 140 K. The longwavelength wing of this dissociation spectrum is exponential in the wavenumber. Its logarithmic slope is proportional to the inverse temperature. Selectivities are high enough at 140 K, that the photons are consumed only for the rare isotope in the case of34SF6 and nearly so for36SF6. For33SF6 further improvement of the selectivity would be desirable.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00693876
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  • 3
    Digitale Medien
    Digitale Medien
    UV-laser induced photo-oxidation of aqueous benzene solutions: Formation of phenol (1982)
    Springer
    Applied physics 27 (1982), S. 191-194 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 35 ; 36 ; 42.60
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Aqueous solutions of benzene were irradiated by focussed KrF laser light. The formation of phenol together with varying amounts of 1.3-cyclopentadiene-1-carboxaldehyde was shown by uv absorption measurements. A mechanism for this photo-oxidation via benzene radical cations produced by 2-photon ionization of benzene is proposed. Comparative gas phase laser experiments and experiments with unfocussed laser beams were consistent with previous results using incoherent light sources.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00697440
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  • 4
    Digitale Medien
    Digitale Medien
    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
    Schlagwort(e): 82.50.−m
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: 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.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF01437848
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  • 5
    Digitale Medien
    Digitale Medien
    Ueber das Brucin (1840)
    New York, NY : Wiley-Blackwell
    Journal für Praktische Chemie/Chemiker-Zeitung 19 (1840), S. 510-511 
    Details
    ISSN: 0021-8383
    Schlagwort(e): Chemistry ; Organic Chemistry
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1002/prac.18400190185
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