RECOMBINATION YIELD OF H2+ EMERGENT FROM ULTRA THIN CARBON-FILMS BELOW THE BOHR VELOCITY

We have used the University of Chicago Scanning Transmission Ion Microscope to measure the yield of H2+ from beams traversing 15 Å to 40 Å carbon films. At 12.5 keV/H the measured yields were about 1 to 10%. Analysis of the yields of H2+ from this experiment and other experiments at higher energy in terms of the rms internuclear separation of the emergent particles and the dwell time in the carbon film shows that the separation is the more important factor. Graphs of yields vs. internuclear separation proyide hints about the mechanism of recombination of H2+. Copyright © 1978 by The Institute of Electrical and Electronics Engineers, Inc.