E.A. Whittaker, H.R. Wendt, et al.
Applied Physics B Photophysics and Laser Chemistry
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 S1 ← S0 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. © 1990 Springer-Verlag.
E.A. Whittaker, H.R. Wendt, et al.
Applied Physics B Photophysics and Laser Chemistry
M. Hoinkis, C.S. Yannoni, et al.
Chemical Physics Letters
H.R. Wendt, H. Hippler, et al.
The Journal of Chemical Physics
P. Arrowsmith, M.S. de Vries, et al.
Applied Physics B Photophysics and Laser Chemistry