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LASER SELECTED IONIZATION OF Rb AND MEASUREMENT OF ISOTOPE SHIFT ON Rb.

Yao Lu

Published Jan 1, 1990• 0 citations
OpenAlex

Abstract

In a heat pipe furnace, Rb atoms, pumped by two-photon Doppler tree absorp tion (760.1 nm), are excited from the ground state 5S1/2 to state 7S. Then the atoms are excited to the ionization state by Nd·YAG laser. The signals of the ions of Rb are amplified by the look-in amplifier and then enter the x-y record. Selected ionization signals of Rb85 and Rb87 are observed, and the isotope shift of Rb(7S) is obtained. The super-fine structure of Rb (5S→7S) has also been observed.

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The 5S1/2 --> 7S1/2 two-photon transition of atomic rubidium, which is 100 times weaker than the 5S-5D transition, is observed with an extended-cavity diode laser and a vapor cell. Signals with a signal-to-noise ratio of 280 are obtained with a laser power of 10 mW, and the observed linewidth is 3 MHz. The laser wavelength is 760 nm and is locked on the transitions to a stability of 2 x 10(-11). For the first time to our knowledge, the isotope shift of this transition is measured to be 130(4) MHz in atomic frequency.

Optics Letters•Aug 1, 2004•20 citations
In a heat pipe furnace, Rb atoms, pumped by two-photon Doppler tree absorp tion (760.1 nm), are excited from the ground state 5S1/2 to state 7S. Then the atoms are excited to the ionization state by Nd·YAG laser. The signals of the ions of Rb are amplified by the look-in amplifier and then enter the x-y record. Selected ionization signals of Rb85 and Rb87 are observed, and the isotope shift of Rb(7S) is obtained. The super-fine structure of Rb (5S→7S) has also been observed.
Doppler-free two-photon absorption spectroscopy was applied to study highly-excited D states of Rb atoms. Using a cw dye laser as an excitation source, transitions from the ground 5S state to nd 2D states (n=11-32) were observed, the ionization energy of the highest state being only 117cm-1. These D doublets are not inverted. The fine structure splittings of these states do not vary as (neff) -3, nor as n-3. The isotope shift of the 85Rb, 87Rb ground states is found to be 160±12MHz. No pressure broadening was observed for these transitions within the instrumental resolution of 15 MHz.
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 .
This paper summarizes a long series of experiments that have been done on Rydberg states of Rb. The basic experimental technique that has been used is atomic-beam laser spectroscopy which allows both low-resolution and high-resolution studies. Excitation of Rydberg states is provided by single-photon absorption from a suitably frequency-doubled rhodamine 6G6G6G tunable laser. Detection is done by field ionization and ion counting. These techniques have allowed us to study the critical ionizing field, which has been found to follow classical, hydrogenic behavior closely. Rydberg states of Rb have been observed from n=28n=28n=28 up to n>100n>100n>100. High-resolution spectroscopic studies have led to measurement of the fine structure for np\mathrm{np}np levels located between n=28n=28n=28 and n=60n=60n=60, as well as the isotope shift of the ground state, $\ensuremath{\delta}\ensuremath{\nu}=(172\ifmmode\pm\else\textpm\fi{}15)$ MHz. Anomalies in the intensity ratio of the doublet $5s\ensuremath{-}np$ transitions have been observed and interpreted as relativistic effects. Perturbations by weak and strong dc electric field are reported. In the case of weak electric fields it is possible to evaluate the polarizability. In the case of strong dc electric fields, new phenomena have been observed and analyzed. We also find experimental evidence of selective photoionization in the presence of an appropriate dc electric field, which could have some applications in laser isotope separation. Finally, we give the preliminary results of an experiment on the effect of a strong nonresonant electromagnetic field on high-lying Rydberg states.
The 5S1/2 --> 7S1/2 two-photon transition of atomic rubidium, which is 100 times weaker than the 5S-5D transition, is observed with an extended-cavity diode laser and a vapor cell. Signals with a signal-to-noise ratio of 280 are obtained with a laser power of 10 mW, and the observed linewidth is 3 MHz. The laser wavelength is 760 nm and is locked on the transitions to a stability of 2 x 10(-11). For the first time to our knowledge, the isotope shift of this transition is measured to be 130(4) MHz in atomic frequency.