Physical Review A

Absolute photoionization cross sections of the Cs 7 D3/2 level measured by use of fluorescence reduction

Keith Bonin, M. Gatzke, Charles L. Collins, Michael A. Kadar-Kallen

Published Jun 1, 1989• 19 citations

Abstract

A simple technique for measuring absolute photoionization cross sections \ensuremath{\sigma} of excited atoms has been applied to the 7${D}_{3/2}$ level in Cs. Past experiments on excited-state cross sections have relied on measurements of the total number of ions or photoelectrons produced by photoionization to deduce \ensuremath{\sigma}. Our technique is novel in that it utilizes the simple measurement of the reduction in the excited-atom fluorescence due to photoionization to find \ensuremath{\sigma}. We report measurements of cross sections at six different photon energies.

DOI: 10.1103/physreva.39.5624

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Physical Review A

Absolute photoionization cross sections of the Cs 7 D3/2 level measured by use of fluorescence reduction

Keith Bonin, M. Gatzke, Charles L. Collins, Michael A. Kadar-Kallen

Published Jun 1, 1989• 19 citations

Publisher

Abstract

A simple technique for measuring absolute photoionization cross sections \ensuremath{\sigma} of excited atoms has been applied to the 7

{D}_{3/2}

level in Cs. Past experiments on excited-state cross sections have relied on measurements of the total number of ions or photoelectrons produced by photoionization to deduce \ensuremath{\sigma}. Our technique is novel in that it utilizes the simple measurement of the reduction in the excited-atom fluorescence due to photoionization to find \ensuremath{\sigma}. We report measurements of cross sections at six different photon energies.

DOI: 10.1103/physreva.39.5624

Related papers

Absolute measurement of the photoionization cross section of the excited 7S state of cesium

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We report the first measurement of the absolute cross section for photoionization of the $7S$ state of cesium. The measurement employed a new technique in which the density of the excited-state atoms was determined by the amount of fluorescence. The cross section for photoionization by 540-nm light is 1.14(10)\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}19}$ ${\mathrm{cm}}^{2}$ . We also propose a second new technique for the absolute measurement of photoionization cross sections which is based on modulated fluorescence.We report the first measurement of the absolute cross section for photoionization of the $7S$ state of cesium. The measurement employed a new technique in which the density of the excited-state atoms was determined by the amount of fluorescence. The cross section for photoionization by 540-nm light is 1.14(10)\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}19}$ ${\mathrm{cm}}^{2}$. We also propose a second new technique for the absolute measurement of photoionization cross sections which is based on modulated fluorescence.

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A simple technique for measuring absolute photoionization cross sections \ensuremath{\sigma} of excited atoms has been applied to the 7

{D}_{3/2}

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

7S

state of cesium. The measurement employed a new technique in which the density of the excited-state atoms was determined by the amount of fluorescence. The cross section for photoionization by 540-nm light is 1.14(10)\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}19}$

{\mathrm{cm}}^{2}

. We also propose a second new technique for the absolute measurement of photoionization cross sections which is based on modulated fluorescence.

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.

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 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.