Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Log inSign up
Challenges
Datasets
Workspaces
Papers
Discussions
Leaderboard
Blog
Job Board
Q3AS

© 2026 Aqora Quantum S.A.S.

TermsPrivacyLegal Notice

Journal of Physics B Atomic and Molecular Physics

Level-crossing effects in optogalvanic spectroscopy

John N. Dodd

Published Aug 14, 1983• 2 citations
Publisher

Abstract

Sub-Doppler width signals have been observed in the optogalvanic current when a magnetic field is altered through regions of Zeeman level crossings. It is shown that the signals can be interpreted as due entirely to population changes in the levels involved.
DOI
10.1088/0022-3700/16/15/014

Related papers

LEVEL-CROSSING OPTOGALVANIC SPECTROSCOPY

Peter Hannaford, David S. Gough, George William Series

Optogalvanic spectroscopy is applied to the detection of level -crossings at zero and finite magnetic fields. The method provides a sensitive, Doppler-free technique for determining hyperfine structures in both lower and upper levels of atomic transitions.

Le Journal de Physique Colloques•Nov 1, 1983•6 citations

Experimental and theoretical investigations of the optogalvanic effect in a Hg-Ar discharge

Wayne H. Richardson, Lute Maleki, E. Garmire

The optogalvanic effect induced in a Hg-Ar discharge by light at 546.1 nm is studied experimentally and theoretically. The plasma and its response to a disturbance in the atomic-level populations are described entirely in terms of electron collision cross sections and other fundamental parameters. In a detailed description of the laser interaction with the atomic system, it was necessary to take into account velocity-changing collisions (VCC). These collisions (VCC) strongly modify the interaction between the Doppler-broadened system and the optical field. In some Doppler-free optogalvanic spectra the dramatic influence of VCC on the velocity distribution of atomic-level population is evident. Measurements of the magnitude of the optogalvanic signal confirm most of the theoretical results. Some anomalous features of the impedance change due to a weak beam were observed when a strong counterpropagating beam was introduced.

Physical Review A•Dec 1, 1987•11 citations

Optical Detection of Level Crossing in a J=12 State

Alan C. Gallagher, Allen Lurio

It is shown theorptically that a level-crossing signal from the m/sub j/ = plus or minus 1/2 sublevels of a J = 1/2 state populated by optical excitation from a J = 1/2 or 3/2 ground state can be observed by observing the scattering of circularly polarized light from the substance. Both the incidert-light and scattered-light directions are assumed perpendicular to the applied d-c magnetic field. The effect is measured in Tl, and the lifetime of the S/sub 1/2 level of Tl is calculated to be (7.8 plus or minus 0.2) x 10/sup -9/ sec by analysis of the width of this level. (T.F.H.)

Physical Review Letters•Jan 1, 1963•21 citations

Resonant optogalvanic effects in optical double resonance modulation spectroscopy

S.P. Tewari, M Kirshna Kumari

The authors have analysed the optical double resonance signal to second order in the modulation of the amplitudes of the two lasers at high intensities. Resonant modulation in the populations of the upper level of the transitions are induced at the effective Rabi frequency alpha 0 , whenever the modulation frequencies themselves or a combination of them becomes equal to O, +or- alpha 0 , +or-2 alpha 0 . It is proposed that by performing experiments similar to those done by Miyazaki et al such Rabi resonances in the populations of the levels may be detected by optogalvanic technique-i.e., by monitoring the oscillations in the current or the voltage at the sum or the difference of the modulation frequencies of the two lasers.

Journal of Physics B Atomic Molecular and Optical Physics•Apr 14, 1989•2 citations

Non-optical observation of laser-induced zero-field level-crossing effects in an atomic beam

J. L. Picqué

Level-crossing effects have been detected non-optically with the use of a Rabi-type atomic-beam method. The sodium beam was excited by intense linearly polarised radiation from a CW narrow-band dye laser. Several superimposed resonances were observed in the atomic-beam signal when scanning the magnetic field around zero. The two narrower resonances are interpreted as high-order non-linear effects. They arise from the coupling of laser-induced Zeeman coherences in the ground state (including a hexa-decapole moment) with the populations of the Zeeman sublevels.

Journal of Physics B Atomic and Molecular Physics•Feb 28, 1978•2 citations

"Anticrossing" Signals in Resonance Fluorescence

Harold Wieder, T. G. Eck

The level-crossing technique of atomic spectroscopy utilizes the spatial interference in the scattering of resonance radiation which can occur when two Zeeman levels of an atom are brought into coincidence ("crossed") by the application of an external magnetic field. "Anticrossing" refers to the case where the two levels involved are coupled by a small static interaction. In this paper the general expression for an anticrossing signal is given and its predictions compared with signals observed in the $2 ^{2}P$ term of Li. It is shown that anticrossings produce signals in many experimental situations for which there would be no signal from a normal level crossing.

Physical Review•Jan 5, 1967•125 citations
The optogalvanic effect induced in a Hg-Ar discharge by light at 546.1 nm is studied experimentally and theoretically. The plasma and its response to a disturbance in the atomic-level populations are described entirely in terms of electron collision cross sections and other fundamental parameters. In a detailed description of the laser interaction with the atomic system, it was necessary to take into account velocity-changing collisions (VCC). These collisions (VCC) strongly modify the interaction between the Doppler-broadened system and the optical field. In some Doppler-free optogalvanic spectra the dramatic influence of VCC on the velocity distribution of atomic-level population is evident. Measurements of the magnitude of the optogalvanic signal confirm most of the theoretical results. Some anomalous features of the impedance change due to a weak beam were observed when a strong counterpropagating beam was introduced.
It is shown theorptically that a level-crossing signal from the m/sub j/ = plus or minus 1/2 sublevels of a J = 1/2 state populated by optical excitation from a J = 1/2 or 3/2 ground state can be observed by observing the scattering of circularly polarized light from the substance. Both the incidert-light and scattered-light directions are assumed perpendicular to the applied d-c magnetic field. The effect is measured in Tl, and the lifetime of the S/sub 1/2 level of Tl is calculated to be (7.8 plus or minus 0.2) x 10/sup -9/ sec by analysis of the width of this level. (T.F.H.)
The authors have analysed the optical double resonance signal to second order in the modulation of the amplitudes of the two lasers at high intensities. Resonant modulation in the populations of the upper level of the transitions are induced at the effective Rabi frequency alpha 0 , whenever the modulation frequencies themselves or a combination of them becomes equal to O, +or- alpha 0 , +or-2 alpha 0 . It is proposed that by performing experiments similar to those done by Miyazaki et al such Rabi resonances in the populations of the levels may be detected by optogalvanic technique-i.e., by monitoring the oscillations in the current or the voltage at the sum or the difference of the modulation frequencies of the two lasers.
Level-crossing effects have been detected non-optically with the use of a Rabi-type atomic-beam method. The sodium beam was excited by intense linearly polarised radiation from a CW narrow-band dye laser. Several superimposed resonances were observed in the atomic-beam signal when scanning the magnetic field around zero. The two narrower resonances are interpreted as high-order non-linear effects. They arise from the coupling of laser-induced Zeeman coherences in the ground state (including a hexa-decapole moment) with the populations of the Zeeman sublevels.
The level-crossing technique of atomic spectroscopy utilizes the spatial interference in the scattering of resonance radiation which can occur when two Zeeman levels of an atom are brought into coincidence ("crossed") by the application of an external magnetic field. "Anticrossing" refers to the case where the two levels involved are coupled by a small static interaction. In this paper the general expression for an anticrossing signal is given and its predictions compared with signals observed in the 22P2 ^{2}P22P term of Li. It is shown that anticrossings produce signals in many experimental situations for which there would be no signal from a normal level crossing.