Abstract

New observations of the einsteinium emission spectrum have increased the number of observed lines from 53 to 290 in the wavelength range 2600–6900 Å. Ten lines have been assigned as transitions to the 5f¹¹ 7s^{2 4}I_15/2° ground state of Es i on the basis of reversal and hyperfine structure. The next odd level is ⁴I_13/2° at 8759.25 cm⁻¹. The lowest even level is ⁶I_15/2 of the 5f¹¹ 7s7p configuration at 17 802.89 cm⁻¹. The lowest level of the 5f¹⁰6d7s² configuration is ⁶I_17/2 at 19 367.93 cm⁻¹. Fifteen lines are classified as The lowest level transitions between Es i levels. Twenty-three lines are assigned as transitions to the two known lowest of Es ii. The hyperfine constants a_5f = 0.033±0.001 cm⁻¹ and b_f = 0.48±0.06 cm⁻¹ have been derived by an analysis of the hyperfine structure of assigned Es ii lines. From these constants for ²⁵³Es, we obtained a nuclear magnetic dipole moment of +3.6±0.4μ_N and a quadrupole moment of +6.0±0.8 b.

© 1974 Optical Society of America

Hyperfine Structure in the ²⁵³Es Emission Spectrum. II. Nuclear Spin, Nuclear Magnetic Dipole Moment, and Energy Levels of Es ii*

Earl F. Worden, Ralph G. Gutmacher, Ronald W. Lougheed, John G. Conway, and Rolf J. Mehlhorn
J. Opt. Soc. Am. 60(10) 1297-1302 (1970)

One-Electron Spectrum of Doubly Ionized Lutetium (Lu iii) and Nuclear Magnetic Dipole Moment of ¹⁷⁵Lu

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Energy levels of neutral californium (²⁴⁹Cf i) and singly ionized californium (²⁴⁹Cf ii)

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Experimental and Theoretical Hyperfine Structure of Low-Lying Levels of Terbium 4f⁸5d6s² Configuration; Quadrupole Moment of ¹⁵⁹Tb

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Preliminary Term Analysis of Am i and Am ii Spectra*

Mark Fred and Frank S. Tomkins
J. Opt. Soc. Am. 47(12) 1076-1087 (1957)