Threshold Electron Studies of Gas-Surface Interactions.
Abstract
The purpose of this program was to test the feasibility of using Threshold excitation spectroscopy (TES) as a new method of performing surface analysis. The TES experiments entailed bombarding the specimen of interest with a beam of nearly monoenergetic electrons and detecting those electrons which underwent near total energy loss upon colliding with the target surface. The result of such collision was a scattered electron with a final kinetic energy close to zero. The program involved designing and constructing a threshold electron spectrometer which incorporated a steradiancy filter to selectively detect low energy electrons. The feasibility experiments entailed using lithium fluoride thin films as the test specimen. The resulting threshold excitation spectrum exhibited peaks at 3.5, 4.5, and 6.3 eV; this was in excellent agreement with previous electron transmission studies in which peaks were attributed to optically forbidden excitonic transitions at the lithium fluoride surface. The fact that similar structure was observed in this program (with better energy resolution) demonstrated that TES is indeed a feasible method of performing surface analysis. Keywords include: Surface Analysis, Electron Energy Loss Spectroscopy, Threshold Excitation Spectroscopy, Thin Films, Lithium Fluoride.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1985
- Accession Number
- ADA151271
Entities
People
- P. T. Murray
Organizations
- University of Dayton