The work of this thesis describes the experimental set-up and measurements for spectroscopic and kinetic studies of ionized helium gas. An injection-controlled KrF 248nm laser beam focussed to an intensity of 3 $\times$ 10$\sp{11}$ Wcm$\sp{-2}$ was used to generate highly ionized tantalum plasma. Helium gas was photoionized by the broadband soft x-ray flux from the laser-produced Ta plasma. The possibilities for realizing a short wavelength laser (below 2000A) have been investigated.
The spectra of He$\sp+$ transitions 4 $\to$ 2 and 3 $\to$ 2 were experimentally measured by an optical multichannel analyzer, and the time evolution of the fluorescences were observed by a fast response photomultiplier. The effects of helium pressure on the fluorescence were also studied. In addition to the experiments, a kinetic model was developed. The properties of ionized helium predicted by this model are in relatively good agreement with the experimental results.
| Identifer | oai:union.ndltd.org:RICE/oai:scholarship.rice.edu:1911/13277 |
| Date | January 1988 |
| Creators | Chen, Jian |
| Contributors | Sauerbrey, Roland |
| Source Sets | Rice University |
| Language | English |
| Detected Language | English |
| Type | Thesis, Text |
| Format | 86 p., application/pdf |
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