Abstract

The 6³D₃ → 6³P₂ (3650 Å) line of mercury has been fully analyzed using both conventional high-resolution photographic techniques and a piezo-electrically scanned Fabry–Perot spectrometer system with photoelectric detection. Pure and enriched isotope lamps were used to isolate and identify the transitions of the 199 and 201 isotopes and to measure the isotope shifts of the even-mass isotopes. Isotope shifts of 7 ± 1 mK per unit atomic mass were found. The 3/2–5/2, 5/2–7/2, and 7/2–9/2 energy differences in the ³D₃ state of the ²⁰¹Hg isotope are, respectively, 206 ± 2, 287 ± 3, and 367 ± 6 mK. The A and B nuclear-moment terms of this state for the 201 isotope are A = −81.8 ± 1 mK and B = +2.0 ± 0.4 mK. Computer fits of the Fabry–Perot spectra of natural mercury were attempted. All transitions fit predicted intensities except for the strong lines that significantly overlap with each other. Within this group of lines there is strong reabsorption. This is a direct consequence of the unique overlap of the most intense transitions caused by small isotope shift and the lack of radiative decay processes for depopulation of the lower state.

© 1975 Optical Society of America

Hyperfine Structure and Isotope Shifts in the 2537-Å Line of Mercury by a New Interferometric Method

Walter G. Schweitzer
J. Opt. Soc. Am. 53(9) 1055-1072 (1963)

Hyperfine Structure in the Spectrum of Mercury Hydride*

Terence L. Porter and Sumner P. Davis
J. Opt. Soc. Am. 53(3) 338-343 (1963)

Hyperfine Structure in the ³P₁ Level of the Twenty-Four-Hour Isomer of Mercury 197†

Henry R. Hirsch
J. Opt. Soc. Am. 51(11) 1192-1202 (1961)

Isotope shift of 47-day ²⁰³Hg†

O. Redi and H. H. Stroke
J. Opt. Soc. Am. 65(1) 1-5 (1975)

Hyperfine-Structure Separations, Isotope Shifts, and Nuclear Magnetic Moments of the Radioactive Isotopes Tl¹⁹⁹, Tl²⁰⁰, Tl²⁰¹, Tl²⁰², and Tl²⁰⁴

R. J. Hull and H. H. Stroke
J. Opt. Soc. Am. 51(11) 1203-1212 (1961)