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M A Baig1, J P Connerade1, C Mayhew1, G Noeldeke1 and M J Seaton1
Published under licence by IOP Publishing Ltd
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Citation M A Baig et al 1984 J. Phys. B: Atom. Mol. Phys. 17 L383
DOI 10.1088/0022-3700/17/12/001
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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.