Improved experimental and theoretical energy levels of neon i

Abstract

The spectrum of neutral neon used as a carrier gas has been measured by the Fourier transform spectroscopy technique from 1800 to 9000 cm-1. We report on transitions leading to improved energy levels for the 4f, 5f, 6f, 7f and the 5g configurations. In addition, we identify transitions leading to the previously unknown 6g and 7g configurations. Theoretically, we have generalized the polarization and pair coupling formulae to the extended quadrupole-polarization model. Explicitly accounting for the 6f'-7f (6g'-7g) quadrupole interaction, our two-parameter expression reproduces 18 observed levels (ng) with a mean deviation of 0.016 cm-1. Inclusion of the 24 observed pairs of nf levels increases the mean deviation to 0.036 cm-1. © 1994 IOP Publishing Ltd.