Precision Measurements in Few-Electron Molecules: The Ionization Energy of Metastable 4He2 and the First Rotational Interval of 4He2+

被引：17

作者：

Semeria, Luca ^{[1
]}

Jansen, Paul ^{[1
]}

Camenisch, Gian-Marco ^{[1
]}

Mellini, Federico ^{[1
]}

Schmutz, Hansjuerg ^{[1
]}

Merkt, Frederic ^{[1
]}

机构：

[1] Swiss Fed Inst Technol, Lab Phys Chem, CH-8093 Zurich, Switzerland

来源：

PHYSICAL REVIEW LETTERS | 2020年 / 124卷 / 21期

基金：

欧洲研究理事会; 瑞士国家科学基金会;

关键词：

SPECTRUM;

D O I：

10.1103/PhysRevLett.124.213001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Molecular helium represents a benchmark system for testing ab initio calculations on few-electron molecules. We report on the determination of the adiabatic ionization energy of the a (3)Sigma(+)(u) state of He-2, corresponding to the energy interval between the a (3)Sigma(+)(u) (v '' = 0, N '' = 1) state of He-2 and the X+ (2)Sigma(+)(u) (v(+) = 0, N+ = 1) state of He-2(+), and of the lowest rotational interval of He-2(+). These measurements rely on the excitation of metastable He-2(+) molecules to high Rydberg states using frequency-comb-calibrated continuous-wave UV radiation in a counterpropagating laser-beam setup. The observed Rydberg states were extrapolated to their series limit using multichannel quantum-defect theory. The ionization energy of He-2 (a (3)Sigma(+)(u)) and the lowest rotational interval of He-2(+) (X+ (2)Sigma(+)(u)) are 34 301.207 002(23) +/- 0.000 037(syst) cm(-1) and 70.937 589(23) +/- 0.000 060(syst) cm(-1), respectively.

引用

页数：6

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