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New measurements of the transition energies of the principal series of helium are reported. They were obtained in a high resolution photoabsorption experiment with synchrotron radiation. It is shown that the wavelength measurements above n=10 are consistent with the more accurate quantum defect extrapolation based on the first nine members to an experimental precision of +or-0.00042 AA.
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Baig et al. (1984) studied this question.
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