Measurement of the first ionization potential of astatine by laser ionization spectroscopy

被引：0

作者：

S. Rothe

A. N. Andreyev

S. Antalic

A. Borschevsky

L. Capponi

T. E. Cocolios

H. De Witte

E. Eliav

D. V. Fedorov

V. N. Fedosseev

D. A. Fink

S. Fritzsche

L. Ghys

M. Huyse

N. Imai

U. Kaldor

Yuri Kudryavtsev

U. Köster

J. F. W. Lane

J. Lassen

V. Liberati

K. M. Lynch

B. A. Marsh

K. Nishio

D. Pauwels

V. Pershina

L. Popescu

T. J. Procter

D. Radulov

S. Raeder

M. M. Rajabali

E. Rapisarda

R. E. Rossel

K. Sandhu

M. D. Seliverstov

A. M. Sjödin

P. Van den Bergh

P. Van Duppen

M. Venhart

Y. Wakabayashi

K. D. A. Wendt

机构：

[1] CERN,Department of Nuclear Physics and Biophysics

[2] Institut für Physik,Department of Physics and Astronomy

[3] Johannes Gutenberg-Universität Mainz,Accelerator Division

[4] University of York,undefined

[5] University of the West of Scotland,undefined

[6] School of Engineering,undefined

[7] The Scottish Universities Physics Alliance (SUPA),undefined

[8] Advanced Science Research Center,undefined

[9] Japan Atomic Energy Agency,undefined

[10] Comenius University,undefined

[11] Centre for Theoretical Chemistry and Physics,undefined

[12] The New Zealand Institute for Advanced Study,undefined

[13] Massey University Auckland,undefined

[14] Private Bag 102904,undefined

[15] Helmholtz Institute Mainz,undefined

[16] IKS KU Leuven,undefined

[17] Celestijnenlaan 200D,undefined

[18] School of Chemistry,undefined

[19] Tel Aviv University,undefined

[20] PNPI NRC KI,undefined

[21] Orlova Roscha,undefined

[22] Ruprecht-Karls Universität,undefined

[23] Seminarstraße 2,undefined

[24] GSI Helmholtzzentrum für Schwerionenforschung,undefined

[25] Planckstraße 1,undefined

[26] Frankfurt Institute for Advanced Studies (FIAS),undefined

[27] Belgian Nuclear Research Centre SCK·CEN,undefined

[28] Boeretang 200,undefined

[29] High Energy Accelerator Research Organization (KEK),undefined

[30] Oho 1-1,undefined

[31] Institut Laue-Langevin (ILL),undefined

[32] 6 rue Jules Horowitz,undefined

[33] TRIUMF,undefined

[34] 4004 Wesbrook Mall,undefined

[35] University of Manchester,undefined

[36] School of Physics and Astronomy,undefined

[37] Institute of Physics,undefined

[38] Slovak Academy of Sciences (IP SASc),undefined

[39] Dúbravskácesta 9,undefined

[40] Present address: Helmholtz-Institute Jena,undefined

[41] Fröbelstieg 3,undefined

[42] D-07743 Jena,undefined

[43] Germany,undefined

来源：

Nature Communications | / 4卷

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摘要：

The radioactive element astatine exists only in trace amounts in nature. Its properties can therefore only be explored by study of the minute quantities of artificially produced isotopes or by performing theoretical calculations. One of the most important properties influencing the chemical behaviour is the energy required to remove one electron from the valence shell, referred to as the ionization potential. Here we use laser spectroscopy to probe the optical spectrum of astatine near the ionization threshold. The observed series of Rydberg states enabled the first determination of the ionization potential of the astatine atom, 9.31751(8) eV. New ab initio calculations are performed to support the experimental result. The measured value serves as a benchmark for quantum chemistry calculations of the properties of astatine as well as for the theoretical prediction of the ionization potential of superheavy element 117, the heaviest homologue of astatine.

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