MASS AND ENERGY-SPECTRA OF MO IONS IN-FIELD EVAPORATION

Authors
Citation
Jb. Wang et Tt. Tsong, MASS AND ENERGY-SPECTRA OF MO IONS IN-FIELD EVAPORATION, Applied surface science, 76(1-4), 1994, pp. 73-79
Citations number
15
Categorie Soggetti
Physics, Condensed Matter","Chemistry Physical","Materials Science, Coatings & Films
Journal title
ISSN journal
01694332
Volume
76
Issue
1-4
Year of publication
1994
Pages
73 - 79
Database
ISI
SICI code
0169-4332(1994)76:1-4<73:MAEOMI>2.0.ZU;2-Q
Abstract
The field-evaporation behavior of Mo is studied with a high-resolution pulsed-laser time-of-flight atom probe. The ion energy distribution o f Mo2+ shows a double peak structure and the ion energy distribution o f Mo3+ has a broad single energy peak. To explain the formation of the low energy peak of the Mo2+ ions and the abnormally small critical en ergy deficit of the Mo3+ ions, we propose a two-step field-evaporation mechanism for molybdenum in which two Mo atoms line up with the field before they are field-ionized. Also at low field strengths (3.7 to 4. 2 V/angstrom) and high temperature (about 600 K), triply charged Mo di mers can be detected.