Measurement of 7p${}_{1/2}$-state hyperfine structure and 7s${}_{1/2}$-7p${}_{1/2}$ transition isotope shift in ${}^{203}$Tl and ${}^{205}$Tl

Abstract

A two-step, two-color laser spectroscopy technique has been used to measure the hyperfine splitting of the 7p${}_{1/2}$ excited state in ${}^{203}$Tl and ${}^{205}$Tl, as well as the isotope shift within the 7s${}_{1/2}$ - 7p${}_{1/2}$ transition. Our measured values for the hyperfine splittings, 2153.2(7) MHz (in ${}^{203}$Tl) and 2173.3(8) MHz (in ${}^{205}$Tl), each differ by 20 MHz from previously published values which quoted comparable precision. The transition isotope shift of ${}^{203}$Tl relative to ${}^{205}$Tl was measured to be 534.4(9) MHz. In our experiment, one laser was locked to the thallium ground-state 6p${}_{1/2}$ - 7s${}_{1/2}$ 378 nm transition, while the second, spatially overlapping laser was scanned across the 7s${}_{1/2}$(F=1) - 7p${}_{1/2}$(F=0,1) hyperfine transitions. To facilitate accurate frequency calibration, radio-frequency modulation of the laser was used to create sidebands in the absorption spectrum.

10 pages, 7 figures

References in corpus (5)

• Development of a configuration-interaction + all-order method for atomic calculations
• Electric dipole moment enhancement factor of thallium
• Polarizabilities, Stark shifts, and lifetimes of In atom
• Relativistic many-body calculations of the Stark-induced amplitude of the 6P1/2 -7P1/2 transition in thallium
• Measurement of the scalar polarizability within the 5P1/2-6S1/2, 410 nm transition in atomic indium

Cited by in corpus (3)

• Measurement of the scalar polarizability of the indium $6p_{1/2}$ state using two-step atomic-beam spectroscopy
• High-precision measurements and theoretical calculations of indium excited-state polarizabilities
• Measurement of hyperfine constants and the isotope shift of rubidium 5P${}_{1/2}$ excited-state using Saturated Absorption Spectroscopy