Abstract

The He iin = 4–5 (10 124 Å) and n = 4–6 (6560 Å) line complexes, not previously studied at high resolution, have been excited in a liquid-nitrogen-cooled hollow cathode and observed with a double Fabry–Perot spectrometer. Relative positions, relative intensities, and widths of the fine-structure components have been determined by computer analysis of the digitally recorded spectra of both 3He and 4He. The relative positions of the best-resolved components have been determined to ±0.002 cm−1 and show agreement with theoretical fine structures and isotope shifts. The accuracy of the position measurements is limited by the highly blended nature of the transitions, there being 19 broadened components over a 1.1-cm−1 range. The observed relative intensities approximated statistical relative intensities except for components arising from S and P states, which were three to five times more intense than the theoretical values. The measured widths of the ion lines are roughly 1.15 times those observed for He i lines. The intensity and width results are consistent with observations previously reported for the He iin = 3–4 (4686 Å) transition and support the conclusions on the excitation mechanisms that were inferred from a study of that transition.

© 1972 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Analysis of the He ii 4686-Å (n = 4 to n = 3) Line Complex Excited in an Atomic-Beam Light Source*

Harold P. Larson and Robert W. Stanley
J. Opt. Soc. Am. 57(12) 1439-1448 (1967)

Optical Study of the Hyperfine Structure of the Rubidium Resonance Lines*

James R. Beacham and Kenneth L. Andrew
J. Opt. Soc. Am. 61(2) 231-235 (1971)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (7)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Tables (7)

You do not have subscription access to this journal. Article tables are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Equations (1)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription