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The necessity for high energy resolution (resolving powers > 100,000) in VUV spectroscopic determinations of atomic and molecular Rydberg electronic structures is emphasized. Examples include spectral observations of Rydberg levels in Ge I near the 4p(2)P( degrees )((1/2)) limit, in Sr I near the 4d(2)D(3/2) limit, and in the diatomic hydrogen halides (especially HI) below the X(2)II(3/2) limit.
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Ginter et al. (1980) studied this question.
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