Kinetic energy distributions of organic ions sputtered from solids and liquids
1985; Elsevier BV; Volume: 67; Issue: 2 Linguagem: Inglês
10.1016/0168-1176(85)80014-8
ISSN1873-2801
AutoresG.J.Q. van der Peyl, Wim J. van der Zande, R Hoogerbrugge, Piet G. Kistemaker,
Tópico(s)Nuclear Physics and Applications
ResumoKinetic energy distributions are measured for mass-selected ions sputtered from solids and liquids with an energy resolution of 0.24 eV (FWHM). The energy distributions of organic ions sputtered from a glycerol matrix have FWHM values in the range 0.3–0.7 eV. Larger values are observed in direct sputtering from solid samples. Sample charging is always observed but can be limited to about 0.2 eV by using a glycerol matrix spiked with HCl or NaCl. The residual charging is independent of the use of neutral or charged primary particles. Molecular-ion and fragment-ion energy distributions are in first order highly similar. In second order for most systems analyzed, a weak increase of the width of the energy distributions is observed with increasing mass of the sputtered ions. Collision cascade contributions are visible from the high-energy tail of the distributions. A thermal spike model applied to the low-energy part of the distribution points to “temperatures” of about 2000–4000 K
Referência(s)