Abstract

The Zeeman effect was studied experimentally and theoretically for two mixed forbidden lines of Sb i. The experimental studies were performed on two separated isotopes (121 and 123) for two directions of observation, i.e., longitudinal (L) and transverse (π and σ) using a silver-coated Fabry–Perot étalon and a three-prism Steinheil spectrograph. The interference effect between M1 and E2 radiation in the ΔM = ±1 Zeeman components has been observed in the 609.8-nm line. By using the percentage admixture of electric-quadrupole radiation predicted by Garstang [ J. Res. Nat. Bur. Stand. Sect. A. 68, 61 ( 1964)], the relative intensities of the ΔM = ±1 and ΔM = 0, ±2 transitions of the hyperfine structure components were calculated as a function of the external magnetic field for both directions of observation. The agreement of the computed and experimentally determined relative intensities shows that the 609.8-nm line contains (1.43 ± 0.45)% of electric-quadrupole radiation. In the Zeeman pattern of the 541.5-nm line of antimony, no interference effect is seen. Thus this line is of a predominantly magnetic-dipole type, which is in agreement with theoretical predictions.

© 1983 Optical Society of America

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