Journal of Physics B Atomic Molecular and Optical Physics

Isotope shift and hyperfine structure measurements of 4s 2S1/2→ 6s 2S1/2two-photon transition of potassium isotopes

P. V. Kiran Kumar, Manda V. Suryanarayana

Published Feb 18, 2011• 12 citations

Abstract

Hyperfine splittings for the 39 K and 41 K isotopes and the isotope shift for the 4s 2 S 1/2 → 6s 2 S 1/2 two-photon transition have been measured using sub-Doppler fluorescence spectroscopy. We have accurately measured the transition isotope shift, and a discrepancy has been found in the earlier reported transition isotope shift value, which has been corrected. The resulting hyperfine splitting values of 418.2 (5) and 230.4 (1.3) MHz for the 39 K and 41 K isotopes respectively are in agreement with previous measurements. The precision of the absolute frequency values for the two-photon transition has been improved by about two orders. Our measured magnetic dipole constants for the upper 6 2 S 1/2 state for the 39 K and the 41 K isotopes are consistent with the earlier measured values.

DOI: 10.1088/0953-4075/44/5/055003

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Journal of Physics B Atomic Molecular and Optical Physics

Isotope shift and hyperfine structure measurements of 4s 2S1/2→ 6s 2S1/2two-photon transition of potassium isotopes

P. V. Kiran Kumar, Manda V. Suryanarayana

Published Feb 18, 2011• 12 citations

Publisher

Abstract

DOI: 10.1088/0953-4075/44/5/055003

Related papers

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We have investigated the $4s {}^{2}{S}_{1/2}\ensuremath{\rightarrow}5p {}^{2}{P}_{1/2}$ transition (

{D}_{1}

line) of the potassium isotopes

^{39}\mathrm{K}

^{40}\mathrm{K}

, and

^{41}\mathrm{K}

using Doppler-free laser saturation spectroscopy. Our measurements reveal the hyperfine splitting of the

5p {}^{2}{P}_{1/2}

state of

^{40}\mathrm{K}

, and we have determined the specific mass shift and the nuclear field shift constants for the blue (405 nm)

{D}_{1}

line.

The hyperfine structure of the ${}^{2}{S}_{1/2}{\ensuremath{-}}^{2}{D}_{5/2}$ quadrupole transition at 674 nm in

{}^{87}{\mathrm{Sr}}^{+}

has been observed. The ion was confined in a Paul trap and cooled using laser radiation at 422 and 1092 nm. The quadrupole transition was observed by monitoring quantum jumps in the 422-nm fluorescence. The odd isotope of strontium has ``clock'' transitions independent of the first-order Zeeman shift and the

{}^{2}{D}_{5/2}

state hyperfine structure constants have been determined as

{A}_{{D}_{5/2}}=2.1743(14)\mathrm{MHz}

and

{B}_{{D}_{5/2}}=49.11(6)\mathrm{MHz}.

Standard uncertainties have been added in parentheses. These values allow the second-order Zeeman shifts to be calculated. The ${}^{88}{\mathrm{Sr}}^{+}{\ensuremath{-}}^{87}{\mathrm{Sr}}^{+}$ isotope shift for the 674-nm quadrupole transition has been measured to be 247.99(4) MHz.

Doppler-free saturated absorption spectroscopy is performed on an enriched radioactive

^{39}\mathrm{Ar}

sample. The spectrum of the

3{s}^{2}3{p}^{5}4s[3/2]{}_{2}

3{s}^{2}3{p}^{5}4p[5/2]{}_{3}

cycling transition at 811.8 nm is recorded, and its isotope shift between

^{39}\mathrm{Ar}

and

^{40}\mathrm{Ar}

is derived. The hyperfine coupling constants

A

and

B

for both the

4s[3/2]{}_{2}

and

4p[5/2]{}_{3}

energy levels in

^{39}\mathrm{Ar}

are also determined. The results partially disagree with a recently published measurement of the same transition. Based on earlier measurements as well as the current work, the isotope shift and hyperfine structure of the corresponding transition in

^{37}\mathrm{Ar}

are also calculated. These spectroscopic data are essential for the realization of laser trapping and cooling of

^{37,39}\mathrm{Ar}

By combining a recent precise measurement of the ionization energy of

{}^{87}

Rb with previous measurements of the ground-state hyperfine structure and ionization energy of

{}^{85}

Rb, an accurate value for the ${}^{85}\text{Rb}{\ensuremath{-}}^{87}\text{Rb}$ isotope shift of the 5

{}^{2}\phantom{\rule{-0.16em}{0ex}}{S}_{1/2}

ground state can be determined. In turn, comparison with additional spectroscopic data makes it possible to evaluate isotope shifts for the low-lying excited states, which are accurate in most cases to about 1 MHz. For the 5

{}^{2}\phantom{\rule{-0.16em}{0ex}}{S}_{1/2}

and 5

{}^{2}\phantom{\rule{-0.16em}{0ex}}{P}_{3/2}

states, the specific mass-shift contribution can be determined in addition to the total shift. This information is particularly useful for spectroscopic analysis of transitions to Rydberg states and for tests of atomic theory.