PRECISION MEASUREMENT OF THE IONIZATION ENERGY OF METASTABLE He2

Jansen, Paul

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https://hdl.handle.net/2142/100645 Copy

Description

Title

PRECISION MEASUREMENT OF THE IONIZATION ENERGY OF METASTABLE He2

Author(s)

Jansen, Paul

Contributor(s)

• Merkt, Frederic
• Semeria, Luca

Issue Date

06/18/18

Keyword(s)

Mini-symposium: Frequency-Comb Spectroscopy

Abstract

Predicting the energy-level structure of molecules from first principles is one of the major goals and tasks of theoretical molecular physics and chemistry. Few-electron molecules are particularly attractive systems for comparison with experimental results because numerically ``exact'' predictions of molecular properties can in principle be obtained, i.e., predictions that are only limited in accuracy by the uncertainties of fundamental constants. We present absolute-frequency measurements of transitions from rotational levels of the a $^3\Sigma_\text{u}^+\,(v''=0)$ metastable state of He${_2}$ to $n$p Rydberg states. The transition frequencies are determined by one-photon UV spectroscopy in slow molecular beams using a narrow-band laser system referenced to a frequency comb. The ionization energy of metastable He$_2$ and the rotational structure of the X$^+$ $^2\Sigma_\text{u}^+\,(v^+=0)$ ground state of He${_2}^+$ have been determined with unprecedented precision and accuracy using Rydberg-series extrapolation.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

English

Permalink

http://hdl.handle.net/2142/100645

DOI

10.15278/isms.2018.MG02

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