Determination of the first ionization energy of polonium by resonance ionization spectroscopy - part I: Measurement of even-parity Rydberg states at TRIUMF-ISAC

被引：18

作者：

Raeder, S. ^{[1
,2
,3
]}

Heggen, H. ^{[1
,3
]}

Teigelhoefer, A. ^{[1
,4
]}

Lassen, J. ^{[1
,4
]}

机构：

[1] TRIUMF, 4004 Wesbrook Mall, Vancouver, BC V6T 2A3, Canada

[2] Helmholtz Inst Mainz, Staudingerweg 18, D-55128 Mainz, Germany

[3] GSI Helmholtzzentrum Schwerionenforsch, Planckstr 1, D-64291 Darmstadt, Germany

[4] Univ Manitoba, Dept Phys & Astron, Winnipeg, MB R3T 2N2, Canada

来源：

SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY | 2019年 / 151卷

基金：

加拿大自然科学与工程研究理事会;

关键词：

Resonance ionization spectroscopy; Polonium; Ionization potential; Ionization energy; Rydberg series; ISOL; LASER ION-SOURCE; HYPERFINE-STRUCTURE; SPECTRUM;

D O I：

10.1016/j.sab.2018.08.005

中图分类号：

O433 [光谱学];

学科分类号：

0703 ; 070302 ;

摘要：

Rydberg levels in the atomic spectrum of the element polonium (Po, Z = 84) were investigated using two-step laser resonance ionization spectroscopy in order to probe and determine the first ionization potential with high accuracy. As polonium has no stable isotopes, laser resonance ionization spectroscopy was carried out in-source at the Isotope Separator On-Line (ISOL) facility where the radioisotope Po-206 was detected after mass separation. Evaluating the convergence of the observed Rydberg series results in a first ionization potential E-IP(Po) = 8.418072(3)(stat)(15)(syst)eV and more than 100 new even-parity Rydberg states belonging to 5 different series. The determined E-IP is compared to available literature values and state of the art theoretical atomic many-body calculations.

引用

页码：65 / 71

页数：7

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