Physics
Scientific paper
Jun 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009mss..confetj01l&link_type=abstract
"International Symposium On Molecular Spectroscopy, 64th Meeting, Held 22-26 June, 2009 at Ohio State University. http://molspec
Physics
Electronic
Scientific paper
A supersonic beam of metastable He_2^* a ^3Σ_{u}^+ molecules was generated using a pulsed discharge at the exit of a pulsed valve prior to the gas expansion into vacuum. Transitions to high np Rydberg states were recorded using photoionization and Rydberg-state-resolved threshold ionization spectroscopy. Overview scans at moderate resolution (0.3 cm^{-1}) were obtained with ionization fields ranging from 1.3 to 133 V/cm, lowering the ionization thresholds by 5.5 and 55 cm^{-1}, respectively. Using a solid-state UV laser system with a 20 MHz bandwidth, high-resolution spectra of Rydberg series with n up to 150 and with resolved fine structure of the initial He_2^* a ^3Σ_{u}^+ (N'') state were recorded. The assignment of the observed Rydberg states is based on multichannel quantum defect theory calculations from a recent study^a of pulsed-field-ionization zero-kinetic-energy (PFI-ZEKE) photoelectron and photoionization spectra of He_2 (see following talk). The extrapolation of the observed Rydberg series to their limits enabled the determination of the ionization energy of the a ^3Σ_{u}^+ state and the rotational structure of the He_2^+ ion with a precision of better than 20 MHz.
M. Raunhardt, M. Schäfer, N. Vanhaecke, F. Merkt}, J. Chem. Phys. 128, 164310 (2008).
R. Seiler, U. Hollenstein, G. M. Greetham, F. Merkt, Chem. Phys. Lett. 346, 201 (2001).
R. Seiler, Th. A. Paul, M. Andrist, F. Merkt}, Rev. Sci. Instr. 76, 103103 (2005).
M. Raunhardt, M. Schäfer, N. Vanhaecke, F. Merkt, J. Chem. Phys. 128, 164310 (2008).
Liu Jinjun
Merkt Frédéric
Raunhardt Matthias
Schäfer Martin
Sprecher Daniel
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