ISSN:
0142-2421
Keywords:
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Physics
Notes:
Multiphoton resonance ionization (MPRI) is used to probe the desorption characteristics of ion-bombarded surfaces of Fe, In and Ni. The effects of primary ion kinetic energy and surface chemistry on the sensitivity and accuracy of MPRI detection are examined. The relative Ni*/Ni° and In2°/In° ratios are found to increase as the energy of the incident Ar+ ion is varied from 300 eV to 1000 eV. A reflecting time-of-flight mass spectrometer is employed to collect efficiently the photoions as well as secondary ions, permitting accurate determination of the ground-state atom fraction and thereby completing a detailed fundamental analysis of the analytical capabilities of the MPRI approach. The ground-state atom fractions are found to parallel changes in surface composition and represent 30-90% of the material desorbed from ion beam-cleaned and air-exposed Fe and In matrices. In contrast, the corresponding secondary ion fractions vary over several orders of magnitude and are difficult to correlate with surface chemistry.
Additional Material:
5 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/sia.740181102
Permalink