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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Offenberger, A.A. Blyth, W. Key, M.H. Wark, J.S. Preston, S. Najmudin, Z. Dangor, A.E. |
| Copyright Year | 1993 |
| Description | Author affiliation: Dept. of Phys., Clarendon Lab., Oxford Univ., UK (Offenberger, A.A.) |
| Abstract | Summary form only given. The authors report on studies of optical ionization of gases produced by 12-ps pulses of focused Raman-shifted KrF laser radiation (/spl gamma/=268 nm) at intensities of 3/spl times/10/sup 17/ W/cm/sup 2/. Measurements of Thomson, stimulated Raman, and stimulated Brillouin scattering have been used to determine the electron energy distribution and temperature in He and Ne (static and pulsed gas jet targets) at pressures of 10/sup -3/ to 1 bar and to investigate the role of parametric instabilities in the laser/plasma interaction. The electron velocity distribution evolves from a multiphoton (tunnel) ionization spectrum at low pressure to a thermal electron distribution at moderate pressure. The ion determined portion of the Thomson-scattered spectrum is highly nonthermal for pressures greater than a few mbar. At high pressure, significant Raman and Brillouin backscattering is observed. Inverse bremsstrahlung absorption is shown to dominate heating from p>10/sup -2/ bar except at the highest pressures where stimulated Raman scattering may also be important. |
| File Size | 92067 |
| File Format | |
| ISBN | 0780313607 |
| ISSN | 07309244 |
| DOI | 10.1109/PLASMA.1993.593041 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 1993-06-07 |
| Publisher Place | Canada |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Ionization Gases Gas lasers Ionizing radiation Electrons Nonlinear optics Optical scattering Optical pulses Pulse measurements Raman scattering |
| Content Type | Text |
| Resource Type | Article |
| Subject | Atomic and Molecular Physics, and Optics Condensed Matter Physics Electrical and Electronic Engineering |
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