Electron beam dispersion measurements in nitrogen using two-dimensional imaging of N2(+) fluorescenceExperimental results are presented related to the radial spread of fluorescence excited by 10 and 20 KeV electron beams passing through nonflowing rarefied nitrogen at 293 K. An imaging technique for obtaining species distributions from measured beam-excited fluorescence is described, based on a signal inversion scheme mathematically equivalent to the inversion of the Abel integral equation. From fluorescence image data, measurements of beam radius, integrated signal intensity, and spatially resolved distributions of N2(+) first-negative-band fluorescence-emitting species have been made. Data are compared with earlier measurements and with an heuristic beam spread model.
Document ID
19920070199
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Clapp, L. H. (NASA Headquarters Washington, DC United States)
Twiss, R. G. (Lockheed Missiles and Space Co., Inc. Sunnyvale, CA, United States)
Cattolica, R. J. (Sandia National Laboratories Livermore, CA, United States)
Date Acquired
August 15, 2013
Publication Date
January 1, 1991
Subject Category
Instrumentation And Photography
Meeting Information
Meeting: International Symposium on Rarefied Gas Dynamics