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

Measurements of the Zeeman mixing cross section of (6)(2)P(1/2)Cs atoms, induced by collision with helium gases.

Ju Gao

Published Jan 1, 1993• 0 citations
OpenAlex

Abstract

Collisional transitions between Zeeman substates of Cs $\\rm 6\\sp2P\\sb{1/2}$ atoms in collisions with He atoms have been investigated by methods of atomic fluorescence spectroscopy. Cs vapour contained in a quartz cell together with helium at low pressure, was selectively excited by pulsed dye-laser radiation to the $\\rm 6\\sp2P\\sb{1/2,-1/2}$ Zeeman substate in a magnetic field of strength ranging from 1.5 T to 7 T. The fluorescence spectrum consisting of components emitted from the directly excited state and from the collisionally populated state, was resolved with a Fabry-Perot interferometer. Measurements of the relative intensities of the fluorescence components yielded the Zeeman mixing cross section for Cs-He collisions. It was found that the enhancement in the cross section varied as B$\\sp2$ in the range 0 $$ 5 T. A theoretical calculation of the magnetic-field enhancement of the cross section was also carried out, using time-dependent perturbation theory. The results of the calculation are in very good agreement with the experimental results at fields in the range 0 $<$ B $<$ 5 T, though not beyond 5 T where further theoretical work remains to be done.Dept. of Physics. Paper copy at Leddy Library: Theses & Major Papers - Basement, West Bldg. / Call Number: Thesis1993 .G365. Source: Masters Abstracts International, Volume: 32-02, page: 0636. Adviser: L. Krause. Thesis (M.Sc.)--University of Windsor (Canada), 1993.

Related papers

Magnetic-field dependence of the cross section for mJ mixing in 2 P1/2 Cs and Rb atoms

W. Kedzierski, Ju Gao, W. E. Baylis +1 more

Transitions between the Zeeman substates of Cs 6 $^{2}\mathrm{P}_{1/2}$ and Rb 5 $^{2}$${\mathit{P}}_{1/2}$ atoms, induced in collisions with He atoms, have been investigated experimentally by methods of atomic fluorescence spectroscopy. The collision process has also been studied theoretically with time-dependent perturbation theory. Cs or Rb vapor contained in a quartz cell together with helium at low pressure was selectively excited by pulsed dye-laser radiation to the $^{2}$${\mathit{P}}_{1/2,\mathrm{\ensuremath{-}}1/2}$ Zeeman substate in a magnetic field ranging from 1.5 T to 7 T. The fluorescence spectrum, consisting of components emitted from the directly excited state and from the collisionally populated state, was resolved with a Fabry-P\'erot interferometer. Measurements of the relative intensities of the fluorescence components yielded the Zeeman mixing cross section for Cs-He and Rb-He collisions. It was found that the Cs 6 $^{2}$${\mathit{P}}_{1/2}$ cross section varied approximately as ${\mathit{B}}^{2}$ in the range 0B0.76 T, showed a much weaker field dependence in the range from 0.76 T to 5 T, where it peaked, and declined slightly at B>5 T. The Rb 5 $^{2}$${\mathit{P}}_{1/2}$ cross section did not exhibit any variation with B. A theoretical calculation of the Cs cross section carried out using time-dependent perturbation theory explains the magnetic-field enhancement in terms of the minute magnetic-field-induced mixing of the ${\mathit{P}}_{1/2}$ and ${\mathit{P}}_{3/2}$ states and the resulting breaking of time-reversal symmetry. The results of the calculation are in good agreement with the experimental results at fields in the range 0B5 T.

Physical Review A•Jun 1, 1994•6 citations

Zeeman mixing in 6(2)P rubidium atoms induced in noble-gas collisions.

Richard B. Middleton

Rubidium vapour, together with a noble gas contained in a cell located in a 4.75T magnetic field, was irradiated with light from a pulsed dye laser. This radiation produced selective excitation of the 6$\\sp{\\rm z}$P$\\sb{\\rm J,m}$ (J = 1/2, 3/2, m = $-$3/2, $-$1/2, 1/2, 3/2) Zeeman substates. Collisions of the excited 6P atoms with He, Ne and Ar atoms and the resulting Zeeman mixing produced a population in the whole 6P Zeeman manifold and resulted in the emission of a Zeeman fluorescence spectrum which was resolved with a scanning Fabry-Perot interferometer, detected with a photomultiplier and stored in a multichannel scaler. The analysis of the fluorescence intensities of the components emitted in the decay of the directly (optically) excited state and of the collisionally populated states in relation to the noble gas densities, yielded the Zeeman mixing cross sections and the cross sections for the relaxation of dipole, quadrupole, and octupole moments.Dept. of Physics. Paper copy at Leddy Library: Theses & Major Papers - Basement, West Bldg. / Call Number: Thesis1991 .M544. Source: Masters Abstracts International, Volume: 30-04, page: 1359. Chairman: L. Krause. Thesis (M.Sc.)--University of Windsor (Canada), 1991.

•Jan 1, 1991•0 citations

mJ mixing and multipole relaxation in 6 2 Prubidium atoms induced by He, Ne, and Ar collisions

W. Kedzierski, R. B. Middleton, L. Krause

Rubidium vapor, contained together with a buffer gas in a quartz cell located in a 4.75-T magnetic field, was irradiated with light from a pulsed dye laser producing selective excitation of each 6 $^{2}$P Zeeman substate in turn. Collisions of the excited and polarized atoms with the ground-state He, Ne, or Ar atoms and the resulting Zeeman mixing produced a population of the whole Zeeman manifold and resulted in the emission of a Zeeman fluorescence spectrum that was resolved with a scanning Fabry-P\'erot interferometer and recorded with a photomultiplier and a multichannel scaler. Measurements of the relative intensities of the fluorescence components in relation to the buffer-gas pressures yielded the absolute (thermally averaged) cross sections for Zeeman mixing and cross sections for relaxation of the atomic multipole moments for collisions with He, Ne, and Ar.

Physical Review A•Jan 1, 1991•9 citations

mJ Mixing in Oriented 6P122 Cesium Atoms, Induced in Collisions with Noble Gases

J. Guiry, L. Krause

The cross sections for disorientation of magnetically oriented $6^{2}P_{\frac{1}{2}}$ cesium atoms, induced in collisions with noble gases, have been determined using Zeeman-scanning techniques at kilogauss magnetic fields. The ${m}_{J}=\ensuremath{-}\frac{1}{2}$, ${m}_{I}=\ensuremath{-}\frac{7}{2}$ hyperfine Zeeman substate was populated selectively by irradiating the cesium-vapor-noble-gas mixture with cesium-resonance radiation, and collisional transitions to the ${m}_{J}=+\frac{1}{2}$, ${m}_{I}=\ensuremath{-}\frac{7}{2}$ substate were monitored by measurements of the relative intensities of the ${\ensuremath{\sigma}}^{\ensuremath{-}}$ and ${\ensuremath{\sigma}}^{+}$ components in resonance fluorescence observed in the direction parallel to the magnetic field. The following cross sections were obtained: Cs-He, 11.8 ${\mathrm{\AA{}}}^{2}$; Cs-Ne, 4.7 ${\mathrm{\AA{}}}^{2}$; Cs-Ar, 10.7 ${\mathrm{\AA{}}}^{2}$; Cs-Kr, 37.9 ${\mathrm{\AA{}}}^{2}$; Cs-Xe, 71.7 ${\mathrm{\AA{}}}^{2}$.

Physical Review A•Jul 1, 1972•13 citations

Multipole relaxation in 52 P potassium atoms by collisions with He, Ne, and Ar

R. W. Berends, W. Kedzierski, L. Krause

Potassium vapor, contained together with a buffer gas in a fluorescence cell located in a 7-T magnetic field, was irradiated with light from a pulsed dye laser producing selective excitation of the ${5}^{2}$${P}_{1/2}$,-1/2 or the ${5}^{2}$${P}_{3/2}$,-3/2 Zeeman substate. Collisions of the excited and polarized atoms and the resulting Zeeman mixing produced a population of the whole Zeeman manifold and resulted in the emission of a fluorescent Zeeman spectrum which was resolved with a Fabry-Perot interferometer and registered with a photomultiplier and multichannel scaler. Measurements of the relative intensities of the fluorescence components yielded the absolute (thermally averaged) multipole-relaxation cross sections and cross sections for Zeeman mixing by collisions with He, Ne, and Ar atoms.

Physical Review A•Jan 1, 1988•5 citations

Magnetic field dependence of cross sections for collisional disorientation of 6 $sup 2$P$sub 1$/$sub 2$ cesium atoms

J. Guiry, L. Krause

The magnetic field dependence of the cross sections for the disorientation of 6 $sup 2$P$sub 1$/$sub 2$ cesium atoms, induced in Cs-He collisions, has been studied using Zeeman scanning techniques. A Cs-He mixture, contained in a fluorescence cell which was located in a magnetic field variable from 0 to 10 kG, was irradiated with the circularly polarized 8943-A component of cesium resonance radiation in a direction parallel to the field, and the polarization of the resonance fluorescence was monitored in the backward direction in relation to the helium pressure and to the magnetic field strength. The cross sections, which are in good agreement with the results obtained previously at high and low magnetic fields, exhibit a variation with the magnetic field, which is in accordance with theoretical predictions. (AIP)

Physical Review A•Dec 1, 1975•0 citations
Collisional transitions between Zeeman substates of Cs rm6sp2Psb1/2\\rm 6\\sp2P\\sb{1/2}rm6sp2Psb1/2 atoms in collisions with He atoms have been investigated by methods of atomic fluorescence spectroscopy. Cs vapour contained in a quartz cell together with helium at low pressure, was selectively excited by pulsed dye-laser radiation to the rm6sp2Psb1/2,−1/2\\rm 6\\sp2P\\sb{1/2,-1/2}rm6sp2Psb1/2,−1/2 Zeeman substate in a magnetic field of strength ranging from 1.5 T to 7 T. The fluorescence spectrum consisting of components emitted from the directly excited state and from the collisionally populated state, was resolved with a Fabry-Perot interferometer. Measurements of the relative intensities of the fluorescence components yielded the Zeeman mixing cross section for Cs-He collisions. It was found that the enhancement in the cross section varied as Bsp2\\sp2sp2 in the range 0 $$ 5 T. A theoretical calculation of the magnetic-field enhancement of the cross section was also carried out, using time-dependent perturbation theory. The results of the calculation are in very good agreement with the experimental results at fields in the range 0 <<< B <<< 5 T, though not beyond 5 T where further theoretical work remains to be done.Dept. of Physics. Paper copy at Leddy Library: Theses & Major Papers - Basement, West Bldg. / Call Number: Thesis1993 .G365. Source: Masters Abstracts International, Volume: 32-02, page: 0636. Adviser: L. Krause. Thesis (M.Sc.)--University of Windsor (Canada), 1993.
Transitions between the Zeeman substates of Cs 6 2P1/2^{2}\mathrm{P}_{1/2}2P1/2​ and Rb 5 2^{2}2P1/2{\mathit{P}}_{1/2}P1/2​ atoms, induced in collisions with He atoms, have been investigated experimentally by methods of atomic fluorescence spectroscopy. The collision process has also been studied theoretically with time-dependent perturbation theory. Cs or Rb vapor contained in a quartz cell together with helium at low pressure was selectively excited by pulsed dye-laser radiation to the 2^{2}2${\mathit{P}}_{1/2,\mathrm{\ensuremath{-}}1/2}$ Zeeman substate in a magnetic field ranging from 1.5 T to 7 T. The fluorescence spectrum, consisting of components emitted from the directly excited state and from the collisionally populated state, was resolved with a Fabry-P\'erot interferometer. Measurements of the relative intensities of the fluorescence components yielded the Zeeman mixing cross section for Cs-He and Rb-He collisions. It was found that the Cs 6 2^{2}2P1/2{\mathit{P}}_{1/2}P1/2​ cross section varied approximately as B2{\mathit{B}}^{2}B2 in the range 0B0.76 T, showed a much weaker field dependence in the range from 0.76 T to 5 T, where it peaked, and declined slightly at B>5 T. The Rb 5 2^{2}2P1/2{\mathit{P}}_{1/2}P1/2​ cross section did not exhibit any variation with B. A theoretical calculation of the Cs cross section carried out using time-dependent perturbation theory explains the magnetic-field enhancement in terms of the minute magnetic-field-induced mixing of the P1/2{\mathit{P}}_{1/2}P1/2​ and P3/2{\mathit{P}}_{3/2}P3/2​ states and the resulting breaking of time-reversal symmetry. The results of the calculation are in good agreement with the experimental results at fields in the range 0B5 T.
Rubidium vapour, together with a noble gas contained in a cell located in a 4.75T magnetic field, was irradiated with light from a pulsed dye laser. This radiation produced selective excitation of the 6sprmz\\sp{\\rm z}sprmzPsbrmJ,m\\sb{\\rm J,m}sbrmJ,m (J = 1/2, 3/2, m = $-$3/2, $-$1/2, 1/2, 3/2) Zeeman substates. Collisions of the excited 6P atoms with He, Ne and Ar atoms and the resulting Zeeman mixing produced a population in the whole 6P Zeeman manifold and resulted in the emission of a Zeeman fluorescence spectrum which was resolved with a scanning Fabry-Perot interferometer, detected with a photomultiplier and stored in a multichannel scaler. The analysis of the fluorescence intensities of the components emitted in the decay of the directly (optically) excited state and of the collisionally populated states in relation to the noble gas densities, yielded the Zeeman mixing cross sections and the cross sections for the relaxation of dipole, quadrupole, and octupole moments.Dept. of Physics. Paper copy at Leddy Library: Theses & Major Papers - Basement, West Bldg. / Call Number: Thesis1991 .M544. Source: Masters Abstracts International, Volume: 30-04, page: 1359. Chairman: L. Krause. Thesis (M.Sc.)--University of Windsor (Canada), 1991.
Rubidium vapor, contained together with a buffer gas in a quartz cell located in a 4.75-T magnetic field, was irradiated with light from a pulsed dye laser producing selective excitation of each 6 2^{2}2P Zeeman substate in turn. Collisions of the excited and polarized atoms with the ground-state He, Ne, or Ar atoms and the resulting Zeeman mixing produced a population of the whole Zeeman manifold and resulted in the emission of a Zeeman fluorescence spectrum that was resolved with a scanning Fabry-P\'erot interferometer and recorded with a photomultiplier and a multichannel scaler. Measurements of the relative intensities of the fluorescence components in relation to the buffer-gas pressures yielded the absolute (thermally averaged) cross sections for Zeeman mixing and cross sections for relaxation of the atomic multipole moments for collisions with He, Ne, and Ar.
The cross sections for disorientation of magnetically oriented 62P126^{2}P_{\frac{1}{2}}62P21​​ cesium atoms, induced in collisions with noble gases, have been determined using Zeeman-scanning techniques at kilogauss magnetic fields. The ${m}_{J}=\ensuremath{-}\frac{1}{2}$, ${m}_{I}=\ensuremath{-}\frac{7}{2}$ hyperfine Zeeman substate was populated selectively by irradiating the cesium-vapor-noble-gas mixture with cesium-resonance radiation, and collisional transitions to the mJ=+12{m}_{J}=+\frac{1}{2}mJ​=+21​, ${m}_{I}=\ensuremath{-}\frac{7}{2}$ substate were monitored by measurements of the relative intensities of the ${\ensuremath{\sigma}}^{\ensuremath{-}}$ and ${\ensuremath{\sigma}}^{+}$ components in resonance fluorescence observed in the direction parallel to the magnetic field. The following cross sections were obtained: Cs-He, 11.8 A˚2{\mathrm{\AA{}}}^{2}A˚2; Cs-Ne, 4.7 A˚2{\mathrm{\AA{}}}^{2}A˚2; Cs-Ar, 10.7 A˚2{\mathrm{\AA{}}}^{2}A˚2; Cs-Kr, 37.9 A˚2{\mathrm{\AA{}}}^{2}A˚2; Cs-Xe, 71.7 A˚2{\mathrm{\AA{}}}^{2}A˚2.
Potassium vapor, contained together with a buffer gas in a fluorescence cell located in a 7-T magnetic field, was irradiated with light from a pulsed dye laser producing selective excitation of the 52{5}^{2}52P1/2{P}_{1/2}P1/2​,-1/2 or the 52{5}^{2}52P3/2{P}_{3/2}P3/2​,-3/2 Zeeman substate. Collisions of the excited and polarized atoms and the resulting Zeeman mixing produced a population of the whole Zeeman manifold and resulted in the emission of a fluorescent Zeeman spectrum which was resolved with a Fabry-Perot interferometer and registered with a photomultiplier and multichannel scaler. Measurements of the relative intensities of the fluorescence components yielded the absolute (thermally averaged) multipole-relaxation cross sections and cross sections for Zeeman mixing by collisions with He, Ne, and Ar atoms.
Magnetic field dependence of cross sections for collisional disorientation of 6 sup2sup 2sup2Psub1sub 1sub1/sub2sub 2sub2 cesium atoms
The magnetic field dependence of the cross sections for the disorientation of 6 sup2sup 2sup2Psub1sub 1sub1/sub2sub 2sub2 cesium atoms, induced in Cs-He collisions, has been studied using Zeeman scanning techniques. A Cs-He mixture, contained in a fluorescence cell which was located in a magnetic field variable from 0 to 10 kG, was irradiated with the circularly polarized 8943-A component of cesium resonance radiation in a direction parallel to the field, and the polarization of the resonance fluorescence was monitored in the backward direction in relation to the helium pressure and to the magnetic field strength. The cross sections, which are in good agreement with the results obtained previously at high and low magnetic fields, exhibit a variation with the magnetic field, which is in accordance with theoretical predictions. (AIP)