Cluster ions from keV-energy ion and atom bombardment of frozen gases

Desorption of cluster ions from adsorbed methane under cryogenic condition by low-energy ion irradiation

“…For ion desorption, it was reported that large cluster ions are desorbed from frozen CO, CO 2 , H 2 O, NH 3 and their mixtures through electronic excitation when the target is irradiated with high-energy ions in the MeV order and fission fragments [4][5][6][7][8][9]. For low-energy ion irradiation, desorption of cluster ions from frozen N 2 by keV Ar + , Kr + , and Xe + ion irradiations was reported [10], and desorption of molecular ions from Ar/Xe and Ar/N 2 mixtures by 400 eV He + ion irradiation was also observed [11]. Although, methane is one of the fundamental molecules for the synthesis of organic and biological molecules, desorption from frozen and adsorbed methane molecules by lowenergy ion irradiation has scarcely been reported.…”

Desorption of cluster ions from solid Ne by low-energy ion impact

“…The authors measured the dependence of the mixing ratio on the desorbed ion yield and discussed the relaxation processes of electronic excitations that lead to the observed atomic and small cluster ion desorption. However, large rare gas cluster ions desorbed by light ion impact have not been observed in the secondary ion mass spectra [7,18,20]. Although the formation and desorption of large clusters from rare gas solids are strongly influenced by momentum transfer processes within the target solids, the mechanism of formation and desorption remains incompletely understood.…”

“…In this model, the linear collision cascade model is no longer valid because most of the atoms in the spike regime are assumed to be in motion. Spike effects become pronounced for very weakly bound condensed gas targets, even when stimulated by ion impacts of several keV or less [7][8][9]. The total desorption yield (the average number of sputtered species per incident ion) for condensed rare gas solids is surprisingly large, representing an effect that cannot be explained using only the linear collision cascade model [10,11].…”

Potential sputtering of ionic species from rare gas solids by multiply charged ion impact

“…Sputtering from RGS by singly charged keV ion impact has been investigated by various groups [7][8][9][10][11][12][13], and a kinetically induced sputtering mechanism has been discussed in detail.…”