Electron-Impact Ionization Cross Section Measurements Out of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mn>5</mml:mn></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mi mathvariant="italic">P</mml:mi></mml:math>Excited State of Rubidium

Keeler, M. L.; Anderson, L. W.; Lin, Chun C.

doi:10.1103/physrevlett.85.3353

Cited by 18 publications

(7 citation statements)

References 15 publications

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“…Most EII studies have involved ground states [1,2]. Only a handful of EII studies have been carried out on excited states, and those only spanning a small range of low principal quantum number n in different targets, viz., rare gases [3], some alkaline earths [11], and alkali metals [12,13]. These studies have revealed a shift of the peak in EIICS to lower electron energies with increasing n and enlarged maximum values, corresponding to decreasing ionization energies [3].…”

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confidence: 93%

Electron Impact Ionization of Sodium Rydberg Atoms below 2 eV

Nagesha

MacAdam

2003

Phys. Rev. Lett.

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We have observed electron impact ionization of highly excited sodium Rydberg atoms in ns and nd states, n=35-51, below E=2 eV electron kinetic energy with energy resolution 0.25 eV. Measured absolute cross sections near 0 eV range from sigma(35d) approximately 7 x 10(-10) to sigma(50d) approximately 4 x 10(-9) cm(2). The energy dependence is consistent with that of widely used binary encounter approximation cross sections, and sigma(n) follows a power law in n. The measured cross sections are 14 to 24 times larger than theoretically predicted values. This enhancement may signal the effect of large polarizabilities of high Rydberg states not yet accounted for in ionization theories.

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confidence: 93%

Electron Impact Ionization of Sodium Rydberg Atoms below 2 eV

Nagesha

MacAdam

2003

Phys. Rev. Lett.

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“…In 'conventional' experimental studies performed by measuring the total flux of ions, the primary reasons for the scatter of data are the large uncertainty of the evaluation of the target vapor density and of the total number of ions created in the collision region. Developed during the last two decades, more sophisticated techniques deal with either the high impact energy regime [8,9,17] or the differential cross sections [18,19] and, therefore, cannot improve significantly the general situation.…”

Section: Introductionmentioning

confidence: 99%

Excitation and ionization of outer shells in Rb by electron impact

Roman¹,

Kupliauskiene²,

Borovik³

2015

J. Phys. B: At. Mol. Opt. Phys.

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The relativistic distorted-wave and binary-encounter-dipole approximations were employed for calculating the electron-impact single ionization cross sections of the 5s, 4p6, 4s2, 3d10 shells and 4p6 excitation cross section for Rb atom taking into account both configuration interaction and relativistic effects. The capabilities of the most used theoretical approaches in describing the single ionization of Rb atom were considered by comparing the present and other available calculated data with the experimental total ionization and total direct single ionization cross sections over the electron-impact energy range from the 5s threshold to 600 eV. The best agreement within experimental uncertainty was obtained by using the non-relativistic binary-encounter-dipole approximation included in the LANL Atomic Physics Codes package. At present none of the used approximations (plane-wave Born or relativistic distorted wave) can satisfactorily describe the experimental excitation-autoionization cross section in rubidium because the efficient formation of the 4p6 core-excited negative-ion rubidium states at near-threshold impact energies is ignored in calculations.

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“…Increasingly sophisticated techniques, both experimental and theoretical, are being applied to meet the demands of basic research and high-technology industry. In this work the trap-loss technique, first developed by Lin and co-workers [1][2][3], is used to determine total cross sections from the fluorescence decays of the trapped atoms, with and without an electron beam present. The loss of atoms from the trap, due to electron collisions, is related directly to the cross section and electron flux through the trap.…”

Section: Introductionmentioning

confidence: 99%

New measurements of absolute total cross sections for electron impact on caesium using a magneto-optical trap

Łukomski

MacAskill

Seccombe

et al. 2005

J. Phys. B: At. Mol. Opt. Phys.

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A new magneto-optical trap designed specifically for the measurement of absolute electron impact cross sections is described. Experimental results for electron impact total cross sections involving 6 2 S ground state Cs are presented over the energy range 5-200 eV. Significant disagreement is obtained between our experimental data and convergent close coupling (CCC) or Breit-Pauli R-matrix calculations at the lower energies. Above 100 eV our data overlap earlier measurements from this laboratory made with a completely different apparatus and agree well with the CCC results. A comparison is made with other measurements using more conventional techniques.

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Electron-Impact Ionization Cross Section Measurements Out of the52PExcited State of Rubidium

Cited by 18 publications

References 15 publications

Electron Impact Ionization of Sodium Rydberg Atoms below 2 eV

Electron Impact Ionization of Sodium Rydberg Atoms below 2 eV

Excitation and ionization of outer shells in Rb by electron impact

New measurements of absolute total cross sections for electron impact on caesium using a magneto-optical trap

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