Low-lying resonances in electron-argon scattering: Measurements at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mn>5</mml:mn><mml:mtext>−</mml:mtext><mml:mi>meV</mml:mi></mml:mrow></mml:math>resolution and comparison with theory

Franz, K.; Hoffmann, Thomas; Bömmels, J.; Gopalan, A.; Sauter, G.D.; Meyer, Wilfried; Allan, Michael; Ruf, M.-W.; Hotop, H.

doi:10.1103/physreva.78.012712

Cited by 8 publications

(22 citation statements)

References 84 publications

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“…The widths of the Ar − (3p 5 4s 2 2 P 3/2 and 2 P 1/2 ) resonances obtained from the partial-wave analysis to the present total cross sections were 2.3 ± 0.2 and 2.2 ± 0.4 meV, respectively, which agree very well with those obtained by recent studies based on the differential cross section at very high resolution [35]. Widths of the Kr − (4p 5 5s 2 2 P 3/2 ) and Xe − (5p 5 6s 2 2 P 3/2 ) resonances were also determined precisely as 3.2 ± 0.1 and 4.1 ± 0.2 meV, respectively.…”

Section: Discussionsupporting

confidence: 90%

“…The present results for the resonance widths for the Ar − 2 P 3/2 and the Ar − 2 P 1/2 resonances show very good agreement with those by Dubé et al [32] and Franz et al [35]. The recent value of Franz et al was based on a phase-shift analysis of the absolute angle differential cross sections measured with two different experimental setups.…”

Section: The Widths Of the Feshbach Resonancessupporting

confidence: 90%

“…the Fribroug instrument used in the work of Franz et al [35]. In the case of Kr, the present results did not agree with the value obtained by the high-resolution measurements of Hoffmann et al The disagreement seems to be the result of using the different phase shifts in the analysis of each study.…”

contrasting

confidence: 87%

“…The energy of 11.1030 ± 0.0010 eV [35] for the resonance energy of the Ar − (3p 5 4s 2 2 P 3/2 ) resonance and that of 7.901 ± 0.016 eV [34] for the Xe − (5p 5 6s 2 2 P 3/2 ) resonance were chosen as the reference point. The accuracies of the energy scale of the present measurements were estimated to be ±3 meV for Ar and ±16 meV for Xe.…”

Section: Methodsmentioning

confidence: 99%

“…The resonant structure of the Feshbach resonances for electron scattering from these rare-gas atoms have been studied extensively by transmission measurements [28][29][30] and elastic electron-scattering measurements [31][32][33][34][35][36]. However, the total cross sections for these resonances have not been reported except for Kr [25].…”

Section: Introductionmentioning

confidence: 99%

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High-resolution total-cross-section measurements for electron scattering from Ar, Kr, and Xe employing a threshold-photoelectron source

et al. 2011

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Absolute total cross sections for electron scattering from Ar and Xe at electron energies ranging from 7 meV to 20 eV were obtained with the experimental technique employing the threshold-photoelectron source. The measured total cross sections are in good agreement with those obtained by other groups down to 100 meV, above which several experimental works have been reported. Scattering lengths for electron scattering from Ar, Kr, and Xe were determined from the present total cross sections and our recent results for Kr using the modified effective range theory. The values of the scattering length obtained in the present analysis differ from the values determined from the previous swarm experiments and beam experiments. The resonant structures in the total cross sections due to Feshbach resonances of Ar, Kr, and Xe with an improved energy resolution were also measured. Analyses of the resonant structure were carried out based on the spin-dependent resonant scattering theory in order to determine the values of the natural width of Feshbach resonances of Ar, Kr, and Xe precisely.

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Section: Discussionsupporting

confidence: 90%

Section: The Widths Of the Feshbach Resonancessupporting

confidence: 90%

contrasting

confidence: 87%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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High-resolution total-cross-section measurements for electron scattering from Ar, Kr, and Xe employing a threshold-photoelectron source

et al. 2011

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Resonance structure in electron–N₂scattering around 11.5 eV: high-resolution measurements,ab initiocalculations and line shape analyses

Hoffmann

Allan

Franz

et al. 2009

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

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Using two different experimental setups with energy widths of about 6 and 13 meV, we obtained significantly improved results for the energy dependence of angle-differential (10 •-180 •) elastic and vibrationally inelastic cross sections for electron scattering from N 2 molecules in the energy range around the narrow N − 2 R 2 + g resonance. The energy location and the natural width of this resonance are determined as 11.497(2) eV and 1.3(2) meV, respectively. Ab initio potential energy curves are obtained from CCSD(T) calculations for the neutral N 2 X 1 + g and N * 2 E 3 + g states as well as for the N − 2 R 2 + g resonance state. They corroborate quite accurately the measured resonance energy and provide accurate energy spacings and overlap integrals for the pertinent vibrational states. A detailed analysis of resonance line shapes for selected scattering angles is performed by applying a model for the interference of resonant and nonresonant scattering processes. It provides a link between the resonance width to absolute DCS and describes elastic and vibrational excitation processes on a common basis. Through both their size and sign, vibrational overlap integrals are shown to determine the observed Fano-type line shapes and account for the opposite asymmetries and intensity changes of adjacent vibrational resonance peaks. Fine-tuning of the fits to the observed shapes is achieved by proper parametrization of the nonresonant amplitudes. A highly resolved excitation function for the formation of the metastable N * 2 (E 3 + g) level from threshold (near 11.88 eV) to 13.4 eV is also presented.

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Differential cross sections for electron elastic scattering and vibrationalv= 1 excitation in nitrogen in the energy range from 5 to 20 eV measured over an angular range of 10°–180°

Linert¹,

Zubek²

2009

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

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Absolute differential cross sections for elastic electron scattering and vibrational, v = 0 → 1, excitation in nitrogen have been measured in the scattering angle range from 10° to 180° and at incident electron energies between 5 eV and 20 eV. The magnetic angle-changing technique has been applied to access the range of scattering angles between 90° and 180°. Integral and momentum cross sections have also been derived by integration of the measured differential cross sections. A comparison with recent theoretical calculations of elastic and vibrational cross sections is presented.

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Low-lying resonances in electron-argon scattering: Measurements at5−meVresolution and comparison with theory

Cited by 8 publications

References 84 publications

High-resolution total-cross-section measurements for electron scattering from Ar, Kr, and Xe employing a threshold-photoelectron source

High-resolution total-cross-section measurements for electron scattering from Ar, Kr, and Xe employing a threshold-photoelectron source

Resonance structure in electron–N₂scattering around 11.5 eV: high-resolution measurements,ab initiocalculations and line shape analyses

Differential cross sections for electron elastic scattering and vibrationalv= 1 excitation in nitrogen in the energy range from 5 to 20 eV measured over an angular range of 10°–180°

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Low-lying resonances in electron-argon scattering: Measurements at5−meVresolution and comparison with theory

Cited by 8 publications

References 84 publications

High-resolution total-cross-section measurements for electron scattering from Ar, Kr, and Xe employing a threshold-photoelectron source

High-resolution total-cross-section measurements for electron scattering from Ar, Kr, and Xe employing a threshold-photoelectron source

Resonance structure in electron–N2scattering around 11.5 eV: high-resolution measurements,ab initiocalculations and line shape analyses

Differential cross sections for electron elastic scattering and vibrationalv= 1 excitation in nitrogen in the energy range from 5 to 20 eV measured over an angular range of 10°–180°

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Product

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Resonance structure in electron–N₂scattering around 11.5 eV: high-resolution measurements,ab initiocalculations and line shape analyses