Evidence for gain on the C VI 182 Å transition in a radiation-cooled selenium/Formvar plasma
| Autor: | Uri Feldman, Charles M. Brown, B. Yaakobi, W.E. Behring, Martin Richardson, John F. Seely |
|---|---|
| Rok vydání: | 1985 |
| Předmět: |
education.field_of_study
Materials science business.industry Population chemistry.chemical_element Plasma Radiation Atomic and Molecular Physics and Optics Spectral line Electronic Optical and Magnetic Materials Optics Formvar chemistry Irradiation Electrical and Electronic Engineering Physical and Theoretical Chemistry Atomic physics business education Selenium Line (formation) |
| Zdroj: | Optics Communications. 54:289-294 |
| ISSN: | 0030-4018 |
| Popis: | Thin plastic foils coated with selenium have been irradiated using from 4 to 8 beams of the OMEGA laser in a line focus configuration. Spectra were recorded using a 3 meter spectrograph that viewed the plasma along the line focus. Based on a comparison of the intensities of the spectral lines from plasmas with lengths of 1.7, 3.4, 6.8, and 13.6 mm, the C VI n = 3 to 2 transition at 182 A was anomalously intense in the spectra from the longer plasmas. Calculations indicate that the carbon plasma was cooled by radiation from the highly-charged selenium plasma in a time that was smaller than the expansion time of the plasma. These plasma conditions are favorable for the occurrence of population inversions between the n = 2 and 3 levels of C VI resulting from recombination and cascading from higher levels. The measured gain coefficient for the C VI 182 A transition is 3/cm, and this corresponds to a gain-length product of 4 in the longest plasma. |
| Databáze: | OpenAIRE |
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