Precision Ramsey-comb spectroscopy of molecular hydrogen in the deep-UV

Eikema, K.S.E.

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https://hdl.handle.net/2142/100583 Copy

Description

Title

Precision Ramsey-comb spectroscopy of molecular hydrogen in the deep-UV

Author(s)

Eikema, K.S.E.

Contributor(s)

• Ubachs, Wim
• Salumbides, Edcel John
• Krauth, J.
• Favier, M.G.J.
• Roth, C.
• Altmann, R.K.
• Dreissen, L.S.

Issue Date

2018-06-18

Keyword(s)

Mini-symposium: Frequency-Comb Spectroscopy

Abstract

High-precision spectroscopy experiments with simple atomic and molecular systems provide important benchmarks for tests of bound-state Quantum Electrodynamics (QED). In recent years there has been significant progress in both experiment [1,2] and theory [3] for QED tests in H2. Even investigations of the proton radius puzzle [4] might become feasible in this molecule if the dissociation energy can be determined at a level of 10 kHz [3]. For this latter target, we developed an excitation method, Ramsey-comb spectroscopy, that enables kHz-level precision spectroscopy in the deep-UV. The method is based on excitation with amplified and upconverted frequency comb laser pulses [5]. It has allowed us to measure the EF1Σ + g − X1Σ + g (0, 0) Q1 two-photon transition at 202 nm with an accuracy of 73 kHz [6]. This result is two orders of magnitude better than obtained with previous experiments, and combined with future improved measurements of the EF ionization energy, this could lead to a dissociation energy with an uncertainty below 100 kHz. New measurements from V=1 and N=0 are now in preparation. Moreover, a new setup has been constructed to extend Ramsey-comb spectroscopy to the vacuum- and extreme-ultraviolet spectral region through high-harmonic generation, and an experiment is in preparation to demonstrate this. [1] J. Liu et al., J. Chem. Phys. 130, 174306 (2009) [2] W. Ubachs et al., J. Mol. Spectr. 320, 1-12 (2016) [3] M. Puchalski et al., Phys. Rev. A 95, 052506 (2017) [4] R. Pohl et al., Science 353, 669 (2016) [5] J. Morgenweg et al., Nature Physics 10, 30-33 (2014) [6] R.K. Altmann et al., Phys. Rev. Lett. 120, 043204 (2018)

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

eng

Permalink

http://hdl.handle.net/2142/100583

DOI

10.15278/isms.2018.MG01

Copyright and License Information

Copyright 2018 K.S.E. Eikema

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