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Abstract:
We report a new method for rapid in-vaccuum deposition of millimeters thick solid parahydrogen (pH2) samples which are remarkable for their excellent optical qualities. Infrared and Raman spectra indicate a very low orthohydrogen content, and a mixed hcp/fcc polycrystalline structure for as-deposited samples. Annealing to 4.5 K converts the samples to polycrystalline hcp. Our approach allows for the efficient trapping and isolation of atomic and molecular dopants by conventional matrix isolation techniques. The increased optical path lengths offer pronounced improvements in the quality of spectroscopic data. We have also observed a variety of novel induced IR absorptions of the pH2 matrix host itself; transitions induced by the presence of trapped atoms, molecules, and ions.
| Limitations: |
 APPROVED FOR PUBLIC RELEASE |
| Pages: |
5 |
| Report Date: |
03 NOV 1997 |
| Report Number: |
A720893 |
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