Measurement of Population Inversion for FUV Transitions in Kr-like Y IV in a High-Current Reflex Discharge
| Autor: | Vlad Soukhanovskii, M. J. May, Vyacheslav N. Shlyaptsev, William H. Goldstein, Michael Finkenthal, Dan Stutman, R Vero, K. B. Fournier |
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| Rok vydání: | 2000 |
| Předmět: | |
| Zdroj: | Physica Scripta. 62:301-306 |
| ISSN: | 1402-4896 0031-8949 |
| Popis: | Kr-like ions are good candidates for FUV lasing since they can be produced in plasmas quite easily. We present results from a spectroscopic investigation of Y IV emission from a high current density, cold cathode reflex discharge. The Y II to Y V emission is recorded in the 200?3000 ? range using photometrically calibrated spectrometers, while the emission of trace aluminum ions serves for plasma diagnostics. The intensities of the Y IV 4d?5p and 5s7?5p transitions strongly increase relative to lines from Y II and Y III with increasing plasma current. The spectra studied here are obtained at a current density of 1.75 A/cm2. Experimental Y IV intensity ratios spanning several excited configurations are compared with collisional radiative predictions of the HULLAC atomic physics package. Good agreement is found for the measured and predicted ratios of 4p55p to 4p55s level populations per statistical weight. Finally, the response of the Kr-like system to a fast, transient excitation pulse is examined using the RADEX code. Large transient gains are predicted for several 5s?5p transitions in Kr-like Y IV. |
| Databáze: | OpenAIRE |
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