Shlyaptsev, V. N., authorHunter, J. R., authorKeenan, R., authorSmith, R. F., authorDunn, J., authorScofield, J. H., authorNilsen, J., authorMoon, S. J., authorMarconi, M. C., authorRocca, Jorge J., authorFilevich, J., authorAmerican Physical Society, publisher2007-01-032007-01-032005Filevich, J., et al., Observation of a Multiply Ionized Plasma with Index of Refraction Greater than One, Physical Review Letters 94, no. 3 (28 January 2005): 035005-1-035005-4.http://hdl.handle.net/10217/67847We 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 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.born digitalarticleseng©2005 American Physical Society.Copyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright.Text