Reactions and Relaxation of Vibrationally Excited Hydrogen
Abstract
An EMR vacuum UV photomultiplier tube was acquired and installed. This tube has a lithium fluoride window and is solar blind. The tube performed as expected and permitted us to obtain spectra of hydrogen in a modified experimental configuration. A serious problem in the past was degradation of the lithium fluoride cell windows due to color center formation. The magnitude of the degradation was sufficient to give us a signal loss of 5% per minute for over 4 orders of magnitude loss. Placement of the cell after the monochromator markedly reduced this degradation. In fact, after a rapid initial degradation of approximately 20-30%, the continued degradation is less than 1% per hour. The reduced degradation was possible because this one window is positioned immediately adjacent to the entrance slit and is over 25 cm from the source discharge. The marked decrease in degradation rate was achieved with not loss of signal intensity. In fact, replacement of the sodium salicylate/visible photo- multiplier detector with the new vacuum UV detector gave a substantial increase in signal.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 23, 1981
- Accession Number
- ADA214715
Entities
People
- Jerome V. Kasper
Organizations
- University of California, Los Angeles