A recently developed laser-excitation technique has been used in the first photoabsorption studies of the even-parity 2p(5)3s3p and 2p(5)3s4p autoionizing levels of Na I. The observed-level values are compared, where applicable, with those previously obtained by ejected-electron spectroscopy of collisionally excited Na, and the identifications are confirmed by ab initio calculations.
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Sugar et al. (1979) studied this question.
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