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Analysis of the desorption of clusters of intact amino acid valine molecules induced by energetic monoatomic and cluster ions

✍ Scribed by G. Szenes

Publisher
Elsevier Science
Year
2005
Tongue
English
Weight
135 KB
Volume
230
Category
Article
ISSN
0168-583X

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✦ Synopsis

The experiments on the desorption of intact valine molecules and (nM + H) + clusters are analyzed and a ln(Y/S e ) À 1/S e scaling is found where Y, and S e are the sputtering yield and the electronic stopping power, respectively. The scaling can be derived with the assumption of a thermal activation mechanism. In the plots the desorption is a uniform process without threshold value of S e , having different activation energies U in various charge states. The desorption of (nM + H) + clusters proceeds in n steps with varying Coulomb contributions. Irradiation with C 10 and C 60 ions leads to higher Y, however, the increment is reduced with the increase of S e .

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