Sauerbrey, Roland A.2009-06-032009-06-031988Chen, Jian. "Spectroscopic and kinetic studies of ionized helium excited by a laser-produced plasma soft x-ray source." (1988) Master’s Thesis, Rice University. <a href="https://hdl.handle.net/1911/13277">https://hdl.handle.net/1911/13277</a>.https://hdl.handle.net/1911/13277The 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.86 p.application/pdfengCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.Atomic physicsOpticsRadiationThesisTHESIS E.E. 1988 CHEN