Fluorescence Experiment and Auroral Data Evaluation to Improve Prediction of Nuclear Atmospheric Infrared Background.
Abstract
The report documents coordinated laboratory and data evaluation research efforts which are relevant to the DNA program for developing capability to predict nuclear enhanced atmospheric infrared background radiance. The laboratory effort involves the use of a dye laser pumped LiNb03 optical parametric oscillator in order to produce a tunable source of intense 2.7 micron light for the purpose of laboratory simulation of the infrared effects of solar or nuclear illumination of the atmosphere. The source is used to excite the specie CO2(101) which can re-radiate at 2.7 micron via 101 yields 000 or at 4.3 micron via 101 yields 100, the latter process is predicted to be a major nuclear effect at 4.3 micron under certain conditions since theoretically it is predicted to occur more often than the former by ratio 20;1. A primary purpose of our laboratory effort was to confirm this prediction, our initial results place a lower limit of 10:1 on the branching ratio. This low precision result can be enhanced by utilizing simple techniques that were not within the scope of the initial effort, namely by the use of (1) well documented techniques for improving laser frequency stability, (2) a cooled 2.7 micron filter mounted in the detector dewar, (3) a multiple pass fluorescence cell, and (4) faster electronics for recording the 2.7 micron signal. Implementation of these techniques should improve the precision of the measurement by more than 2 orders of magnitude. Additionally, the initial effort has demonstrated the applicability of the laser source and peripheral vacuum and electronic equipment for the high precision measurements of quenching and vibration transfer rate coefficients.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 28, 1979
- Accession Number
- ADA085724
Entities
People
- J. B. Kumer
- T. C. James
Organizations
- Lockheed Martin Missiles and Space