Bulletin of the American Physical Society
APS March Meeting 2019
Volume 64, Number 2
Monday–Friday, March 4–8, 2019; Boston, Massachusetts
Session L24: Precision spectroscopy of molecules: status and perspectives
11:15 AM–2:03 PM,
Wednesday, March 6, 2019
BCEC
Room: 159
Sponsoring
Unit:
DAMOP
Chair: Sergiy Bubin, Nazarbayev University
Abstract: L24.00002 : Precision spectroscopy of molecular hydrogen and its ion through molecular Rydberg states and MQDT-assisted extrapolation of Rydberg series
11:51 AM–12:03 PM
Presenter:
Maximilian Beyer
(Department of Physics, Yale University)
Authors:
Maximilian Beyer
(Department of Physics, Yale University)
Nicolas Hölsch
(ETH Zurich)
Christian Jungen
(Department of Physics and Astronomy, University College London)
Frederic Merkt
(ETH Zurich)
The energy-level structure of H2+ can be calculated extremely precisely and by comparison with the results of precise spectroscopic measurements, fundamental constants or particle properties, such as the proton-to-electron mass ratio or the proton size, may be determined.
Spin-rovibrational intervals in H2+ are determined with sub-MHz accuracy from high-resolution measurements of Rydberg series of H2 followed by Rydberg-series extrapolation using multichannel quantum defect theory.
For the excitation of Rydberg states, a resonant three-photon excitation scheme was employed, using pulsed VUV and VIS laser sources to reach the intermediate double-well GK state and a continuous-wave near-infrared laser source for the excitation to the Rydberg states. The valence state - Rydberg state intervals could be measured with a relative accuracy of 3E-10 using an optical frequency comb for the frequency calibration of the cw laser and employing a procedure to minimize systematic uncertainties. The measurements were used to determine the spin-rotational intervals of the first three rotational levels of para H2+ and the fundamental vibrational interval.
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