Ultraviolet laser desorption of indole
| Autor: | Donald H. Levy, Jeffrey W. Elam |
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| Rok vydání: | 1997 |
| Předmět: | |
| Zdroj: | The Journal of Chemical Physics. 106:10368-10378 |
| ISSN: | 1089-7690 0021-9606 |
| DOI: | 10.1063/1.474071 |
| Popis: | Ultraviolet laser desorption from a thick, 120 K indole film was studied. Using a 2660 A, 10 ns desorption laser at 75 mJ/cm2, 2.0 monolayers of indole are removed per shot. Indole0 is the only neutral species desorbed and it has an internal temperature Ti=210 K and a translational temperature Tt=3400 K. The velocity distribution is non-Boltzmann and the angular distribution is bimodal and forward peaked with major component proportional to cos7(θ). No evidence of “jetlike” structure in the desorbed plume is found: Different regions of the plume are at the same internal temperature and both internally hot and cold molecules have identical angle velocity distributions. While existing collisional models cannot account for the details of these distributions, they suggest that 2–7 collisions per molecule occur following desorption producing minor vibrational cooling ( |
| Databáze: | OpenAIRE |
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