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Optics Letters

Hyperfine structure and isotope shifts in the 5955-nm (a^3F_2–z^5F_1) ground-state transition in Zr I

Peter Hannaford

Published Mar 15, 1992• 4 citations
Publisher

Abstract

Two recent determinations of the (91)Zr hyperfine structure in the z(5)F(1) level of Zr I are found to differ by a factor of almost 5. A reexamination of the data confirms the results obtained in our previous investigation: A(z(5)F(1)) = 273.6 +/- 0.3 MHz, B(z(5)F(1)) = 5.9 +/- 0.6 MHz, and hence deltav = -99.6 +/- 1.0 MHz for the (91)Zr-(90)Zr isotope shift in the 595.5-nm (a(3)F(2)-z(5)F(1)) ground-state transition.

DOI
10.1364/ol.17.000432

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Two recent determinations of the (91)Zr hyperfine structure in the z(5)F(1) level of Zr I are found to differ by a factor of almost 5. A reexamination of the data confirms the results obtained in our previous investigation: A(z(5)F(1)) = 273.6 +/- 0.3 MHz, B(z(5)F(1)) = 5.9 +/- 0.6 MHz, and hence deltav = -99.6 +/- 1.0 MHz for the (91)Zr-(90)Zr isotope shift in the 595.5-nm (a(3)F(2)-z(5)F(1)) ground-state transition.
By combining a recent precise measurement of the ionization energy of 87{}^{87}87Rb with previous measurements of the ground-state hyperfine structure and ionization energy of 85{}^{85}85Rb, an accurate value for the ${}^{85}\text{Rb}{\ensuremath{-}}^{87}\text{Rb}$ isotope shift of the 5 2S1/2{}^{2}\phantom{\rule{-0.16em}{0ex}}{S}_{1/2}2S1/2​ 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 2S1/2{}^{2}\phantom{\rule{-0.16em}{0ex}}{S}_{1/2}2S1/2​ and 5 2P3/2{}^{2}\phantom{\rule{-0.16em}{0ex}}{P}_{3/2}2P3/2​ 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.
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.
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Abstract Using a Rb cell and a wavemeter, with a Doppler-free two-photon transition near 993 nm, we have measured the four hyperfine components (two isotopes, Δ F = 0) of the 5S–6S transition, finding the absolute energies of those transitions to a spectral resolution of 0.002 cm −1 = 60 MHz. We find the (87 minus 85) isotope shift of the 5S–6S transition to be +94(12) MHz. Using our single frequency cw laser with focused intensity up to 10 4 W cm −2 at the cell, we find no AC Stark or light shift of the lines at 6 MHz spectral resolution. We find no density shift of the lines at 6 MHz spectral resolution, for a range of Rb atom densities from 3 × 10 11 to 5 × 10 13 atoms/cm 3 .