Chinese Physics Letters

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, Zhong Yin-Peng, Long-Wei Liu, Xing-Can Dai, Ping Xue, Xiang-Yuan Xu, Zhi-Ping Zhong

Published Jan 1, 2012• 8 citations

Publisher

Abstract

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.

DOI: 10.1088/0256-307x/29/1/013201

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Chinese Physics Letters

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, Zhong Yin-Peng, Long-Wei Liu, Xing-Can Dai, Ping Xue, Xiang-Yuan Xu, Zhi-Ping Zhong

Published Jan 1, 2012• 8 citations

Publisher

Abstract

DOI: 10.1088/0256-307x/29/1/013201

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We report on measurements of the cross section for photoionization of Rb atoms in the highly excited

{5D}_{5/2}

level at wavelengths ranging from 1064 to 532 nm (photoelectron energies of 0.175 to 1.34 eV). We efficiently populate the

{5D}_{5/2}

level using coherent two-photon excitation of trapped atoms with pulses in the counterintuitive order. The absolute photoionization cross sections are then measured via the increased loss of atoms from the magneto-optical trap when it is illuminated by the photoionizing light. Our results are in good agreement with new calculations based on the valence-electron parametric potential method.

We report the measurement of the photoionization cross sections of the

5{S}_{1/2}

and

5{P}_{3/2}

states of

^{87}\mathrm{Rb}

in a two-species Hg and Rb magneto-optical trap (MOT) by the cooling laser for Hg. The photoionization cross sections of Rb in the

5{S}_{1/2}

and

5{P}_{3/2}

states at 253.7 nm are determined to be ${1}_{\ensuremath{-}1}^{+4.3}\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}20}\phantom{\rule{0.28em}{0ex}}{\text{cm}}^{2}$ and $4.63(30)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}18}\phantom{\rule{0.28em}{0ex}}{\text{cm}}^{2}$, respectively. To measure the

5{S}_{1/2}

and

5{P}_{3/2}

state fractions in the MOT we detected the photoionization rate of the

5{P}_{3/2}

state by an additional 401.5 nm laser. The photoionization cross section of Rb in the

5{P}_{3/2}

state at 401.5 nm is determined to be $\text{1.18(10)}\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}17}\phantom{\rule{0.28em}{0ex}}{\text{cm}}^{2}$.

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.