Abstract
The charge-state distribution of field-evaporated tungsten ions has been measured as a function of electric field using the pulsed-laser atom probe. The results confirm the recent post-ionization model of Haydock and Kingham and give the first experimental evidence for multiple post-ionization. At low field strengths ( 3.0 V/\AA{}) and high surface temperatures (> 1000 K), field-evaporated triply charged dimers are detected, and built-up regions which significantly enhance the local electric field at the desorption site are observed.
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