The study of K{α} line absorption by point-projection backlighting is presented for a laser-produced aluminum plasma at electronic densities below 5×{}10²¹ cm^-3. The appearance of ionic species as a function of distance from the target is measured absolutely by the use of a knife edge as a spatial fiducial. These data are used to determine the gradient of the average charge as a function of space. A non-local-thermodynamic-equilibrium ionization model has been developed to determine temperature and densities consistent with this measure. Comparisons with hydrodynamic codes are presented, along with a discussion of the inferred temperature.
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Back et al. (1992) studied this question.
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