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 Title: PRECISION MEASUREMENT OF THE IONIZATION ENERGY OF METASTABLE He2 Author(s): Jansen, Paul Contributor(s): Merkt, Frederic; Semeria, Luca Subject(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. Issue Date: 06/18/18 Publisher: International Symposium on Molecular Spectroscopy Citation Info: APS Genre: Conference Paper / Presentation Type: Text Language: English URI: http://hdl.handle.net/2142/100645 DOI: 10.15278/isms.2018.MG02 Other Identifier(s): MG02 Date Available in IDEALS: 2018-08-172018-12-12
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