AVS 50th International Symposium
    Applied Surface Science Wednesday Sessions
       Session AS-WeP

Paper AS-WeP14
Field Emission Electron Spectroscopy of Clean and Oxidized Mo <110> Single Tips

Wednesday, November 5, 2003, 11:00 am, Room Hall A-C

Session: Poster Session
Presenter: X. Zhao, The College of William and Mary
Authors: X. Zhao, The College of William and Mary
R.A. Outlaw, The College of William and Mary
R.L. Champion, The College of William and Mary
D. Manos, The College of William and Mary
B.C. Holloway, The College of William and Mary
Correspondent: Click to Email
We have constructed a multi-functional apparatus to characterize surfaces by ARAES, ARXPS, EELS and TDS both prior to and after, measurement of field emission spectra. The fine structure of field emission energy distributions, in concert with these adjunct surface analyses, provides information of both bulk band structure and localized electronic structure as a function of adsorbate uptake. This paper reports measurements of field emission spectra taken on a 10 nm radius Mo <110> tip under UHV (~10@super -10@ torr), and as a function of exposure to controlled doses of CO and O@super 2@ . Effective work functions are extracted from Fowler-Nordheim plots and show variation over the range of gas dosage. Field emission theory with total energy representation (TED) is used to further interpret the spectra and to elucidate the effects of oxygen bearing adsorbates.