Aufsatz
A clear atomic example for the surface sensitivity of penning ionization
(He^*(2^3S) + Yb)
Abstract
Using a crossed-beam apparatus with a double hemispherical electron spectrometer,
we have studied the spectrum of electrons released in thermal energy ionizing collisions of metastable
He^*(2^3S) atoms with ground state Yb(4f^14 6s^2 ^1S_0) atoms, thereby providing the first Penning electron spectrum of an atomic target with-4f-electrons. In contrast to the HeI (58.4nm) and NeI (73.6/74.4nm)
photoelectron spectra of Yb, which show mainly 4f- and 6s-electron emission in about a 5:1 ratio, the He^*(2^3S) Penning electron spectrum is dominated by 6s-ionization, acoompnnied by some correlation-
induced 6p-emission (8% Yb+( 4f^14 6p^2P) formation) and very little 4f-ionization (<_~ 2.5%).
This astounding result is attributed to the electron exchange mechanism for He^*(2^3S) ionization and reflects the poor overlap of the target 4f-electron wavefunction with the 1s-hole of He^*(2^3S),
as discussed on thc basis of Dirac-Fock wave functions for the Yb orbitals and through calculations of the partial ionization cross sections involving semiempirical complex potentiale. The presented case may be regarded as the elearest atomic example for the surface sensitivity of He^*(2^3S) Penning
ionization observed so far.
we have studied the spectrum of electrons released in thermal energy ionizing collisions of metastable
He^*(2^3S) atoms with ground state Yb(4f^14 6s^2 ^1S_0) atoms, thereby providing the first Penning electron spectrum of an atomic target with-4f-electrons. In contrast to the HeI (58.4nm) and NeI (73.6/74.4nm)
photoelectron spectra of Yb, which show mainly 4f- and 6s-electron emission in about a 5:1 ratio, the He^*(2^3S) Penning electron spectrum is dominated by 6s-ionization, acoompnnied by some correlation-
induced 6p-emission (8% Yb+( 4f^14 6p^2P) formation) and very little 4f-ionization (<_~ 2.5%).
This astounding result is attributed to the electron exchange mechanism for He^*(2^3S) ionization and reflects the poor overlap of the target 4f-electron wavefunction with the 1s-hole of He^*(2^3S),
as discussed on thc basis of Dirac-Fock wave functions for the Yb orbitals and through calculations of the partial ionization cross sections involving semiempirical complex potentiale. The presented case may be regarded as the elearest atomic example for the surface sensitivity of He^*(2^3S) Penning
ionization observed so far.
Citation
In: Annalen der Physik. - Leipzig : Barth, 47.1990. - S. 635 - 648Citation
@article{urn:nbn:de:hebis:34-2008081223186,
author={Hotop, Hartmut and Ruf, Martin W. and Yencha, A. J. and Fricke, Burkhard},
title={A clear atomic example for the surface sensitivity of penning ionization},
year={1990}
}
0500 Oax 0501 Text $btxt$2rdacontent 0502 Computermedien $bc$2rdacarrier 1100 1990$n1990 1500 1/eng 2050 ##0##urn:nbn:de:hebis:34-2008081223186 3000 Hotop, Hartmut 3010 Ruf, Martin W. 3010 Yencha, A. J. 3010 Fricke, Burkhard 4000 A clear atomic example for the surface sensitivity of penning ionization :He^*(2^3S) + Yb / Hotop, Hartmut 4030 4060 Online-Ressource 4085 ##0##=u http://nbn-resolving.de/urn:nbn:de:hebis:34-2008081223186=x R 4204 \$dAufsatz 4170 7136 ##0##urn:nbn:de:hebis:34-2008081223186
2008-08-12T09:05:24Z 2008-08-12T09:05:24Z 1990 0003-3804 urn:nbn:de:hebis:34-2008081223186 http://hdl.handle.net/123456789/2008081223186 899690 bytes application/pdf eng Urheberrechtlich geschützt https://rightsstatements.org/page/InC/1.0/ 530 A clear atomic example for the surface sensitivity of penning ionization Aufsatz Using a crossed-beam apparatus with a double hemispherical electron spectrometer, we have studied the spectrum of electrons released in thermal energy ionizing collisions of metastable He^*(2^3S) atoms with ground state Yb(4f^14 6s^2 ^1S_0) atoms, thereby providing the first Penning electron spectrum of an atomic target with-4f-electrons. In contrast to the HeI (58.4nm) and NeI (73.6/74.4nm) photoelectron spectra of Yb, which show mainly 4f- and 6s-electron emission in about a 5:1 ratio, the He^*(2^3S) Penning electron spectrum is dominated by 6s-ionization, acoompnnied by some correlation- induced 6p-emission (8% Yb+( 4f^14 6p^2P) formation) and very little 4f-ionization (<_~ 2.5%). This astounding result is attributed to the electron exchange mechanism for He^*(2^3S) ionization and reflects the poor overlap of the target 4f-electron wavefunction with the 1s-hole of He^*(2^3S), as discussed on thc basis of Dirac-Fock wave functions for the Yb orbitals and through calculations of the partial ionization cross sections involving semiempirical complex potentiale. The presented case may be regarded as the elearest atomic example for the surface sensitivity of He^*(2^3S) Penning ionization observed so far. open access He^*(2^3S) + Yb In: Annalen der Physik. - Leipzig : Barth, 47.1990. - S. 635 - 648 Hotop, Hartmut Ruf, Martin W. Yencha, A. J. Fricke, Burkhard
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