The electron-density profile in the corona of 40-{μ}m-diam glass spheres irradiated by 100-GW, 50-ps pulses from a Nd-glass laser was measured. Critical density scale lengths of 1.5 {μ}m have been observed at rather low intensity (3×{}10¹⁴ W/cm²). At high irradiance (10¹⁵ W/cm²) variation of density is sufficient to blur the interferograms. This observation is correlated with an increase of fast-ion emission.
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Benattar et al. (1980) studied this question.
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