Observation of multiply ionized plasmas with dominant bound electron contribution to the index of refraction

We report anomalous fringe shifts observed in soft X-ray laser interferograms of laser-created Al plasmas. This clear experimental evidence shows that the contribution of bound electrons can dominate the index of refraction of laser-created plasmas at soft X-ray wavelengths, resulting in values grea...

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Bibliographic Details
Published in:Journal of quantitative spectroscopy & radiative transfer 2006-05, Vol.99 (1), p.165-174
Main Authors: 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.
Format: Article
Language:English
Subjects:
Anomalous dispersion
Index of refraction
Interferometry
Plasmas
Soft X-ray laser
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Summary:We report anomalous fringe shifts observed in soft X-ray laser interferograms of laser-created Al plasmas. This clear experimental evidence shows that the contribution of bound electrons can dominate the index of refraction of laser-created plasmas at soft X-ray wavelengths, resulting in values greater than 1. The comparison of measured and simulated interferograms shows that this results from the dominant contribution of low-charge ions to the index of refraction. This usually neglected bound electron contribution can affect the propagation of soft X-ray radiation in plasmas and the interferometric diagnostics of plasmas for many elements.
ISSN:0022-4073
1879-1352
DOI:10.1016/j.jqsrt.2005.05.013