Physical Review A

Photoionization cross sections for excited laser-cooled cesium atoms

Onofrio M. Maragò, D. Ciampini, F. Fuso, E. Arimondo, C. Gabbanini, Steven Trent Manson

Published Jun 1, 1998• 37 citations

Abstract

Losses from a cesium magneto-optical trap induced by an additional laser ionizing the atoms in the ${6P}_{3/2}$ state have been measured as a function of the intensity and frequency of the ionizing laser. The absolute cross section for ionization of the ${6P}_{3/2}$ state has been derived as a function of the wavelength of the ionizing laser. Our values are compared with previous ones and available theoretical predictions. A simple model describing the photoionization processes has been developed.

DOI: 10.1103/physreva.57.r4110

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Measurement of the photoionization cross section of the 6P3/2 state of cesium

Brian M. Patterson, T. Takekoshi, R. J. Knize

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Use of trapped atoms to measure absolute photoionization cross sections

Timothy P. Dinneen, Christopher D. Wallace, Kit-Yan N. Tan +1 more

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Photoionisation of laser-cooled cesium 6 [sup 2]P[sub 3/2] atoms

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Physical Review A

Photoionization cross sections for excited laser-cooled cesium atoms

Onofrio M. Maragò, D. Ciampini, F. Fuso, E. Arimondo, C. Gabbanini, Steven Trent Manson

Published Jun 1, 1998• 37 citations

Publisher

Abstract

Losses from a cesium magneto-optical trap induced by an additional laser ionizing the atoms in the

{6P}_{3/2}

state have been measured as a function of the intensity and frequency of the ionizing laser. The absolute cross section for ionization of the

{6P}_{3/2}

state has been derived as a function of the wavelength of the ionizing laser. Our values are compared with previous ones and available theoretical predictions. A simple model describing the photoionization processes has been developed.

DOI: 10.1103/physreva.57.r4110

Related papers

Measurement of the photoionization cross section of the 6P3/2 state of cesium

Brian M. Patterson, T. Takekoshi, R. J. Knize

We report the measurement of the absolute photoionization cross section for the ${6P}_{3/2}$ state of cesium. Cross sections were determined by measuring the photoionization rate of cesium atoms confined in a magneto-optical trap. The photoionization rate was measured by monitoring the decay of trap fluorescence during exposure to ionizing laser radiation. The measurements were made in the wavelength range 457.9 to 501.7 nm using several lines from an Ar-ion laser. Our results are compared to other experimental measurements as well as to existing theories.We report the measurement of the absolute photoionization cross section for the ${6P}_{3/2}$ state of cesium. Cross sections were determined by measuring the photoionization rate of cesium atoms confined in a magneto-optical trap. The photoionization rate was measured by monitoring the decay of trap fluorescence during exposure to ionizing laser radiation. The measurements were made in the wavelength range 457.9 to 501.7 nm using several lines from an Ar-ion laser. Our results are compared to other experimental measurements as well as to existing theories.

Physical Review AMar 1, 199934 citations

Use of trapped atoms to measure absolute photoionization cross sections

Timothy P. Dinneen, Christopher D. Wallace, Kit-Yan N. Tan +1 more

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Optics LettersDec 1, 199278 citations

Photoionisation of laser-cooled cesium 6 [sup 2]P[sub 3/2] atoms

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AIP conference proceedingsJan 1, 19981 citation

Photoionization for Na and Li cold atoms in a MOT

Volker Wippel, C. Binder, W. Huber +4 more

Summary form only given. Photoionization of cold atoms in their first excited state has been applied to measure the photoionization cross section in rubidium magneto-optical trap (MOT), and cesium MOT. The modifications of the MOT loading rate and of the steady state number of trapped atoms allow one to measure the dependence of the cold atom photoionization cross section on the laser wavelength for absorption from the excited atomic state. We report here on measurements of photoionization cross-sections of both laser-cooled sodium and lithium atoms at various photoionization wavelengths.Summary form only given. Photoionization of cold atoms in their first excited state has been applied to measure the photoionization cross section in rubidium magneto-optical trap (MOT), and cesium MOT. The modifications of the MOT loading rate and of the steady state number of trapped atoms allow one to measure the dependence of the cold atom photoionization cross section on the laser wavelength for absorption from the excited atomic state. We report here on measurements of photoionization cross-sections of both laser-cooled sodium and lithium atoms at various photoionization wavelengths.

Conference on Lasers and Electro-OpticsAug 29, 20050 citations

Electron-impact ionization cross sections out of the ground and 6P2 excited states of cesium

Michał Łukomski, Sean Sutton, W. Kedzierski +6 more

An atom trapping technique for determining absolute, total ionization cross sections (TICS) out of an excited atom is presented. The unique feature of our method is in utilizing Doppler cooling of neutral atoms to determine ionization cross sections. This fluorescence-monitoring experiment, which is a variant of the ``trap loss'' technique, has enabled us to obtain the experimental electron impact ionization cross sections out of the Cs $6\phantom{\rule{0.2em}{0ex}}^{2}{P}_{3∕2}$ state between $7\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$ and $400\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$ . CCC, RMPS, and Born theoretical results are also presented for both the ground and excited states of cesium and rubidium. In the low energy region $(<11\phantom{\rule{0.3em}{0ex}}\mathrm{eV})$ where best agreement between these excited state measurements and theory might be expected, a discrepancy of approximately a factor of five is observed. Above this energy there are significant contributions to the TICS from both autoionization and multiple ionization.An atom trapping technique for determining absolute, total ionization cross sections (TICS) out of an excited atom is presented. The unique feature of our method is in utilizing Doppler cooling of neutral atoms to determine ionization cross sections. This fluorescence-monitoring experiment, which is a variant of the ``trap loss'' technique, has enabled us to obtain the experimental electron impact ionization cross sections out of the Cs $6\phantom{\rule{0.2em}{0ex}}^{2}{P}_{3∕2}$ state between $7\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$ and $400\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$. CCC, RMPS, and Born theoretical results are also presented for both the ground and excited states of cesium and rubidium. In the low energy region $(<11\phantom{\rule{0.3em}{0ex}}\mathrm{eV})$ where best agreement between these excited state measurements and theory might be expected, a discrepancy of approximately a factor of five is observed. Above this energy there are significant contributions to the TICS from both autoionization and multiple ionization.

Physical Review ASep 21, 200627 citations

Measurement of the Absolute Photoionization Cross Section for the 5 P 3/2 State of 87 Rb in a Vapor Cell Magneto-optic Trap

Wei Huang, Ya-Ping Ruan, Feng-Dong Jia +6 more

We report the measurement of the absolute photoionization cross section for the 5P 3/2 state of 87 Rb at wavelength of 473 nm, which results in the photoelectron energies of 33 meV above the ionization threshold, using cold atoms confined in a vapor-loaded magneto-optical trap. The 87 Rb 5P 3/2 photoionization cross section at 473 nm is determined to be σ PI = 10.5 ± 2.2 Mb. Considering the spatial distribution of the trapped atoms, the average intensity of the ionization laser seen by an atom in the MOT instead of ionizing laser intensity I PI is used in our calculations for the photoionization cross sections. The excited state fraction is also accurately estimated using the latest experimental result.We report the measurement of the absolute photoionization cross section for the 5P 3/2 state of 87 Rb at wavelength of 473 nm, which results in the photoelectron energies of 33 meV above the ionization threshold, using cold atoms confined in a vapor-loaded magneto-optical trap. The 87 Rb 5P 3/2 photoionization cross section at 473 nm is determined to be σ PI = 10.5 ± 2.2 Mb. Considering the spatial distribution of the trapped atoms, the average intensity of the ionization laser seen by an atom in the MOT instead of ionizing laser intensity I PI is used in our calculations for the photoionization cross sections. The excited state fraction is also accurately estimated using the latest experimental result.

Chinese Physics LettersJan 1, 20128 citations

Losses from a cesium magneto-optical trap induced by an additional laser ionizing the atoms in the

{6P}_{3/2}

state have been measured as a function of the intensity and frequency of the ionizing laser. The absolute cross section for ionization of the

{6P}_{3/2}

We report the measurement of the absolute photoionization cross section for the

{6P}_{3/2}

state of cesium. Cross sections were determined by measuring the photoionization rate of cesium atoms confined in a magneto-optical trap. The photoionization rate was measured by monitoring the decay of trap fluorescence during exposure to ionizing laser radiation. The measurements were made in the wavelength range 457.9 to 501.7 nm using several lines from an Ar-ion laser. Our results are compared to other experimental measurements as well as to existing theories.

6\phantom{\rule{0.2em}{0ex}}^{2}{P}_{3∕2}

state between

7\phantom{\rule{0.3em}{0ex}}\mathrm{eV}

and

400\phantom{\rule{0.3em}{0ex}}\mathrm{eV}

. CCC, RMPS, and Born theoretical results are also presented for both the ground and excited states of cesium and rubidium. In the low energy region

(<11\phantom{\rule{0.3em}{0ex}}\mathrm{eV})

where best agreement between these excited state measurements and theory might be expected, a discrepancy of approximately a factor of five is observed. Above this energy there are significant contributions to the TICS from both autoionization and multiple ionization.