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Journal of Physics B Atomic Molecular and Optical Physics

The pure diamagnetic spectrum of strontium

Roger James Elliott, G Droungas, J P Connerade, X-H He, K T Taylor

Published Aug 14, 1996• 13 citations
Publisher

Abstract

We report on one-photon laser spectroscopy experiments in which we have obtained the even z-parity diamagnetic spectrum of Sr by actively cancelling the motional Stark effect. This spectrum differs from previous experimental studies in that it contains no electric-field-induced structure. New calculations are reported at a resolution comparable with the experimental data, and an excellent agreement between theory and experiment is obtained.

DOI
10.1088/0953-4075/29/15/009

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We report on one-photon laser spectroscopy experiments in which we have obtained the even z-parity diamagnetic spectrum of Sr by actively cancelling the motional Stark effect. This spectrum differs from previous experimental studies in that it contains no electric-field-induced structure. New calculations are reported at a resolution comparable with the experimental data, and an excellent agreement between theory and experiment is obtained.
We report new experiments on the spectrum of Sr atoms in crossed electric and magnetic fields. We apply an experimental geometry which enables the two circular polarizations to be detected and recorded separately, thereby considerably simplifying the observed structure. This experimental procedure allows Stark maps for the diamagnetic structure to be constructed. We compare the data for Sr with analogous data reported recently for Ba. We also present theoretical calculations of the crossed-field spectrum, which agree well with our observations.
With time-of-flight and electric field ionization detection technique, we investigate the motional Stark effect for highly excited Rydberg barium in high magnetic field and its active cancellation experimentally. In the experiment, the atom beam is aligned at a small angle of 15° with respect to the magnetic field. The motional Stark effect cancellation is demonstrated on two sets of circularly polarized spectra in static magnetic field B = 1.00000 Tesla and B = 1.70000 Tesla, respectively, although the effect is very small (~3.5 Vcm −1 ) in our apparatus configuration.
We report on the experimental spectral observations of barium in parallel electric and magnetic fields. The laser pulse is linearly polarized along or perpendicular to the fields, leading to the states m = 0 and the states m = ±1 populated, respectively, by one photon excitation. By sweeping the electric field, we observe the linear and nonlinear splitting of the diamagnetic spectrum as the electric field increases. The spectral anticrossing is induced by the atomic core effect. The Stark spectrum also shows an obvious nonlinear quadratic behavior when the applied magnetic field varies strongly. All spectra are well explained by the full quantum calculation after taking the quantum defect effects of the channel n s up to n f into account.
We report diamagnetic spectra of sodium atoms observed in a strong magnetic field up to 3 T and compare them with theoretical calculations based on the formulation of an exact quantum-defect theory. We focus on one-photon absorption processes from the ground 3s3s3s state to the excited npnpnp Rydberg states whose magnetic quantum numbers are determined by the polarization of the laser field. The calculations employ BBB-spline basis expansion and the complex spatial coordinate rotation technique, and their results agree well with the observed ones when atomic core effects are appropriately taken into account. When graphed against magnetic field, level anticrossings and core-induced interaction of the npnpnp states provide clear signatures for studying the effects of quantum defect on the diamagnetic spectra.