Controlled formation of weakly bound atomic negative ions by electron transfer from state-selected Rydberg atoms

Reicherts, M.; Roth, T.; Gopalan, A.; Ruf, M.-W.; Hotop, H.; Desfrançois, C.; Fabrikant, I. I.

doi:10.1209/epl/i1997-00434-8

Cited by 26 publications

(27 citation statements)

References 25 publications

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“…In the paper [23], we investigated resonance structures in the electron scattering differential and integral cross sections for tenuously bound atomic systems, E < 0.1 eV in the context of the quenching of Rydberg states by ground state atoms with small EAs [47,48]. In the Au, Pt, and At atoms as well as the C 60 and other fullerene molecules, the meaning of the EAs was in the context of electron attachment to the ground state of neutral complex heavy systems.…”

Section: Resultsmentioning

confidence: 99%

Low-Energy Electron Elastic Total Cross Sections for Ho, Er, Tm, Yb, Lu, and Hf Atoms

Felfli

Msezane

2020

Atoms

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The robust Regge-pole methodology wherein is fully embedded the essential electron-electron correlation effects and the vital core polarization interaction has been used to explore negative ion formation in the large lanthanide Ho, Er, Tm, Yb, Lu, and Hf atoms through the electron elastic total cross sections (TCSs) calculations. These TCSs are characterized generally by dramatically sharp resonances manifesting ground, metastable, and excited negative ion formation during the collisions, Ramsauer-Townsend minima, and shape resonances. The novelty and generality of the Regge-pole approach is in the extraction of the negative ion binding energies (BEs) of complex heavy systems from the calculated electron TCSs. The extracted anionic BEs from the ground state TCSs for Ho, Er, Tm, Yb, Lu, and Hf atoms are 3.51 eV, 3.53 eV, 3.36 eV, 3.49 eV, 4.09 eV and 1.68 eV, respectively. The TCSs are presented and the extracted from the ground; metastable and excited anionic states BEs are compared with the available measured and/or calculated electron affinities. We conclude with a remark on the existing inconsistencies in the meaning of the electron affinity among the various measurements and/or calculations in the investigated atoms and make a recommendation to resolve the ambiguity.

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Section: Resultsmentioning

confidence: 99%

Low-Energy Electron Elastic Total Cross Sections for Ho, Er, Tm, Yb, Lu, and Hf Atoms

Felfli

Msezane

2020

Atoms

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“…, in thermal collisions of Rydberg atoms ( ) nl A with polar and quadrupolar molecules and atoms B possessing low energies of electron affinity. To this end several authors have developed an efficient Rydberg electron transfer (RET) technique for the production of multipolebound anions (see [21][22][23][24] and references therein). RET technique allows one to determine the binding energy, | | e b , of a weakly bound anion using the experimental data for the peak position, n max , in n-dependence of the ion-pair formation cross section and simple semiempirical relation between n max and | | e b obtained in [18].…”

Section: Introductionmentioning

confidence: 99%

Resonant quenching of Rydberg atomic states by highly polar molecules

Нариц

Mironchuk

Лебедев

2016

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

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The results of theoretical studies of the resonant quenching and ion-pair formation processes induced by collisions of Rydberg atoms with highly polar molecules possessing small electron affinities are reported. We elaborate an approach for describing collisional dynamics of both processes and demonstrate the predominant role of resonant quenching channel of reaction for the destruction of Rydberg states by electron-attaching molecules. The approach is based on the solution of the coupled differential equations for the transition amplitudes between the ionic and Rydberg covalent terms of a quasimolecule formed during a collision of particles. It takes into account the possibility of the dipole-bound anion decay in the Coulomb field of the positive ionic core and generalizes previous models of charge-transfer processes involving Rydberg atoms to the cases, when the multistate Landau-Zener approaches become inapplicable. Our calculations for ( ) nl Rb atom perturbed by C H SO 2 4 3 , CH CHCN 2 , CH NO 3 2 , CH CN 3 , C H O 3 2 3 , and C H O 3 4 3molecules show that the curves representing the dependence of the resonant quenching cross sections on the principal quantum number n are bell-shaped with the positions of maxima being shifted towards lower values of n and the peak values, ( ) s max q , several times higher than those for the ion-pair formation, ( ) s max i . We obtain a simple power relation between the energy of electron affinity of a molecule and the position of maximum in n-dependence of the resonant quenching cross section. It can be used as an additional means for determining small binding energies of dipole-bound anions from the experimental data on resonant quenching of Rydberg states by highly polar molecules.

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“…[7][8][9][10][11][12][13][14][15][16] The excited rare gas atoms can be metastable atoms, optically allowed excited atoms, 16 or even highly excited Rydberg atoms. [17][18][19][20] Most Penning ionization experiments involved the long-lived metastable species He(2 3 S) and He(2 1 S), since the excitation energies E(2 3 S) = 19.8 eV and E(2 1 S) = 20.6 eV are larger than the lowest ionization energies of almost all atoms and molecules except for He and Ne. For the calculations, reliable model potentials are important as they directly impact on the accuracy of estimated collision characteristics such as the total ionization cross sections and their collisional-energy dependence.…”

Section: Introductionmentioning

confidence: 99%

Long-range interactions of excited He atoms with the alkaline earth atoms Mg, Ca, and Sr

Zhang

Mitroy

Zhou

et al. 2013

The Journal of Chemical Physics

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Controlled formation of weakly bound atomic negative ions by electron transfer from state-selected Rydberg atoms

Cited by 26 publications

References 25 publications

Low-Energy Electron Elastic Total Cross Sections for Ho, Er, Tm, Yb, Lu, and Hf Atoms

Low-Energy Electron Elastic Total Cross Sections for Ho, Er, Tm, Yb, Lu, and Hf Atoms

Resonant quenching of Rydberg atomic states by highly polar molecules

Long-range interactions of excited He atoms with the alkaline earth atoms Mg, Ca, and Sr

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