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  • 82.50.-m  (1)
  • 82.80 Bi  (1)
  • 1
    Digitale Medien
    Digitale Medien
    Laser desorption jet-cooling of organic molecules (1990)
    Springer
    Applied physics 51 (1990), S. 395-403 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 35.80 s ; 82.80 Bi ; 47.45 Nd
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract Laser desorption followed by jet-cooling allows wavelength-selective as well as mass-selective detection of molecules desorbed from a surface without fragmentation. The cooling characteristics and detection sensitivity of laser desorption jet-cooling of organic molecules are investigated. From the rotational contour of the electronic origin of the S 1 ← S 0 transition of laser-desorbed anthracene, rotational cooling to 5–10 K is demonstrated. Vibrational cooling is studied for laser-desorbed diphenylamine, a molecule with low-energy vibrations, and a vibrational temperature below 15 K is found. The absolute detection sensitivity is determined for the perylene molecule. Using two-color (1+1) resonance enhanced multi-photon ionization (with a measured ionization efficiency of 0.25) for detection, it is found that one ion is produced in the detection region for every 2×105 perylene molecules evaporated from the desorption laser spot. A two-color (1+1) REMPI spectrum (400 points) of perylene is recorded using only 30 picogram of material.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00329101
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Laser FM spectroscopy with photochemical modulation (1984)
    Springer
    Applied physics 35 (1984), S. 105-111 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 0.7.65.Eh ; 82.50.-m ; 33.20.Kf
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We have combined the techniques of frequency-modulation spectroscopy (FMS) and photochemical-modulation spectroscopy to carry out high-resolution, high-sensitivity absorption measurements on the formyl and amino radicals. Using the (0,90, 0)-(0,01, 0) band of theÃ,2 A″- $$\tilde X$$ ,2 A′ transition of HCO at 614 nm, we obtained a sensitivity limit for absorption of 1.5×10−6. Reconstructed spectra of several HCO lines are presented.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00697429
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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