| Numéro |
J. Phys. Colloques
Volume 47, Numéro C2, Mars 1986
32 nd International Field Emission Symposium / 32ème Symposium International d'Emission de Champ
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| Page(s) | C2-121 - C2-131 | |
| DOI | https://doi.org/10.1051/jphyscol:1986218 | |
J. Phys. Colloques 47 (1986) C2-121-C2-131
DOI: 10.1051/jphyscol:1986218
FIELD ION EMISSION FROM ADSORBED FILMS - HYDROGEN AND XENON
P.R. SCHWOEBEL1, 2 et G.R. HANSON1, 21 School of Applied and Engineering Physics
2 The National Research and Resource Facility for Submicron Structures, Knight Laboratory, Cornell University, Ithaca, NY 14853, U.S.A.
Abstract
Liquid hydrogen adlayers are observed in field ion emission at 0.6V/Å and 5.0K. An antecedent to the liquid formation is the appearance of stable, condensed droplets of a critical size in the ion emission pattern as the emitter temperature is decreased. For pure hydrogen gas, the droplets form in the regions of highest field for annealed <110> emitters and appear as stationary, low current emission regions producing ≈ 1pA. In the presence of helium background gas, the droplets are mobile. These droplets form on the lower field regions, primarily the crystal facets of 211, and spread across the emitter surface before the liquid layer appears in the ion emission. Apparent liquid and solid effects occur for xenon ion emission at ≈ 53K.