The 3 d-nf ( n = 4, 5, 6) and 4 f -5 g transitions in He I, appearing in the extra-photographic infrared, have been measured with a wavenumber accuracy better than 0.01 cm -1 . Improved level values have been derived for the 4 f , 5 f , 6 f and 5 g terms. The experimental values are compared with values calculated from the polarization formula.
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Ulf Litzén (1970) studied this question.
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