Abstract

The absorption spectrum of atomic argon below 1000 Å has been investigated with a 6.65-m vacuum spectrograph and with the helium continuum for background. The expected five ns and nd Rydberg series have been extended as far as lines with n about 50 and greater. The ionization energies obtained are 127 109.9±0.1 cm−1 and 128 541.8±0.3 cm−1 for P2320 and P2120 states of Ar ii, respectively. Strong interactions between nd and nd′ series are observed as perturbations and autoionizations. Six additional (weak) Rydberg series are identified as electric-quadrupole transitions to 3p5np and 3p5nf levels.

© 1970 Optical Society of America

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