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Journal Article

Laser desorption jet-cooling of organic molecules; Cooling Characteristics and Detection Sensitivity

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Meijer, G., de Vries, M. S., Hunziker, H. E., & Wendt, H. R. (1990). Laser desorption jet-cooling of organic molecules; Cooling Characteristics and Detection Sensitivity. Applied Physics B: Lasers and Optics, 51(6), 395-403. doi:10.1007/BF00329101.

Cite as: https://hdl.handle.net/21.11116/0000-000C-2262-F
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.