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Physical Review A

Stark Effect in He II and H

STANLEY BASHKIN, G. W. Carriveau

Published Feb 1, 1970• 8 citations
Publisher

Abstract

The beam-foil light source was used for a study of the Stark effect on He II ($\ensuremath{\lambda}4686$\AA{}) and ${\mathrm{H}}_{\ensuremath{\beta}}$. For the former, the $p$ and $s$ components were detected for transverse and longitudinal fields. The transverse-field data suggest that levels of high $j$ are underpopulated relative to their equilibrium numbers. The longitudinal-field data are anomalous. For ${H}_{\ensuremath{\beta}}$, splitting was observed, but the arrangement precluded the detection of polarization. The data also imply underpopulation of levels of high $j$.

DOI
10.1103/physreva.1.269

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The beam-foil light source was used for a study of the Stark effect on He II (\ensuremathλ4686\ensuremath{\lambda}4686\ensuremathλ4686\AA{}) and H\ensuremathβ{\mathrm{H}}_{\ensuremath{\beta}}H\ensuremathβ​. For the former, the ppp and sss components were detected for transverse and longitudinal fields. The transverse-field data suggest that levels of high jjj are underpopulated relative to their equilibrium numbers. The longitudinal-field data are anomalous. For H\ensuremathβ{H}_{\ensuremath{\beta}}H\ensuremathβ​, splitting was observed, but the arrangement precluded the detection of polarization. The data also imply underpopulation of levels of high jjj.
Passage of a beam of foil-excited He+{\mathrm{He}}^{+}He+ ions through a small electric field induced quasiperiodic fluctuations in the intensity of the light emitted from levels n=7,8,9,and10n=7, 8, 9, \mathrm{and} 10n=7,8,9,and10. Both He3{\mathrm{He}}^{3}He3 and He4{\mathrm{He}}^{4}He4 beams were used. Only one foil was needed, in contrast to the double-foil arrangement reported necessary for hydrogen. The observations are discussed in terms of Stark-induced interference of the fine-structure levels of He ii, but discrepancies between the data and the calculations are large.
We show the existence of spin-Hall effect of light (SHEL) in an atomic medium which is made anisotropic via electromagnetically induced transparency. The medium is made birefringent by applying an additional linearly polarized coupling light beam. The refractive index and the orientation of the optics axis are controlled by the coupling beam. We show that after transmitting the atomic medium, a linearly polarized probe light beam splits into its two spin components by opposite transverse shifts. With proper choice of parameters and atomic density of about 2.5×1017 m−32.5\times10^{17}\,\mathrm{m}^{-3}2.5×1017m−3, the shifts are about the order of wavelength and can be larger than the wavelength by increasing the atomic density. We propose a novel measurement scheme based on a balanced homodyne detection (BHD). By properly choosing the polarization, phase, and transverse mode of the local oscillator of the BHD, one can independently measure (i) the SHEL shifts of the two spin components; (ii) the spatial and angular shifts; (iii) the transverse and longitudinal shifts. The measurement can reach the quantum limit of precision by detecting signals at the modulation frequency of the electro-optic modulator used to modulate the input probe beam. The precision is estimated to be at the nanometer level limited by the quantum noise.
Polarization up to 15% has been detected in the decay of electronic levels in many-electron monatomic systems which were excited by the beam-foil method, the foil being tilted with its plane at 65\ifmmode^\circ\else\textdegree\fi{} to the particle velocity. Quantum beats were found even with an external magnetic field oriented parallel to the particle velocity, indicating that coherence is produced in the beam-foil interaction itself. Results are reported for various levels in He i, O ii, and Ar ii.
Stark broadening of the Hα\alphaα line of hydrogen at low densities: fine structure and spontaneous emission effects