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

2018-06-18

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 3Σ + u (v 00 = 0) metastable state of He2 to np 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 He2 and the rotational structure of the X+ 2Σ + u (v + = 0) ground state of He2 + have been determined with unprecedented precision and accuracy using Rydberg-series extrapolation.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

eng

Permalink

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

DOI

10.15278/isms.2018.MG02

Copyright and License Information

Copyright 2018 Paul Jansen

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