Blue shifts of {~}85-60 m{} have been observed for the first five members of the C vi Lyman series emitted from a laser-produced plasma plume at an electron density near 10²¹ cm^-3. These shifts are much larger than density-dependent effects associated with electron collisions and inhomogeneities in ion-produced electric microfields and opposite to plasma polarization shifts according to the linearized Debye model. A nonlinear Debye-type model is consistent with the measurements.
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Adcock et al. (1983) studied this question.
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