Observation of a multiply ionized plasma with index of refraction greater than one

Journal Article · Thu Oct 14 00:00:00 EDT 2004 · Physical Review Letters

OSTI ID:15011420

Filevich, J; Rocca, J J; Marconi, M C; Moon, S J; Nilsen, J; Scofield, J H; Dunn, J; Smith, R F; Keenan, R; Hunter, J R; Shlyaptsev, V N

We present clear experimental evidence showing that the contribution of bound electrons can dominate the index of refraction of laser created plasmas at soft x-ray wavelengths. We report anomalous fringe shifts in soft x-ray laser interferograms of Al laser-created plasmas. The comparison of measured and simulated interferograms show that this results from the dominant contribution of low charge ions to the index of refraction. This usually neglected bound electron contribution can a.ect the propagation of soft x-ray radiation in plasmas and the interferometric diagnostics of plasmas for many elements.

• Research Organization: Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 15011420
• Report Number(s): UCRL-JRNL-207242; TRN: US0501212
• Journal Information: Physical Review Letters, Vol. 94
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
ELECTRONS
LASERS
PLASMA
RADIATIONS
REFRACTIVE INDEX
WAVELENGTHS
X-RAY LASERS