Abstract
The photoabsorption spectrum of neon in the range 500-700 AA has been investigated at high resolution using synchrotron radiation and a 3 m normal incidence vacuum spectrograph equipped with holographic gratings. All of the five Rydberg series 2p5(2P32/)ns(3/2)10, nd(1/2)10 and 2p5(1P12/)ns(1/2)10, nd(3/2)10 have been extended to high principal quantum numbers yielding accurate values for the ionisation potentials (2P32/=173 929.6+or-0.2 cm-1 and 2P12/=174 709.8+or-0.2 cm-1). In contrast with the corresponding features of heavier rare gases, the ns-nd interchannel interactions and autoionisation broadening are shown to be weak. The behaviour is discussed with reference to multichannel quantum defect and Hartree-Fock theory, and is shown to result from centrifugal barrier effects in the nd channels.
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