Determination of the Interval between the Ground States of Para- and Ortho-H_{2}.
- Beyer M Laboratorium für Physikalische Chemie, ETH Zürich, 8093 Zürich, Switzerland.
- Hölsch N Laboratorium für Physikalische Chemie, ETH Zürich, 8093 Zürich, Switzerland.
- Hussels J Department of Physics and Astronomy, LaserLaB, Vrije Universiteit Amsterdam, de Boelelaan 1081, 1081 HV Amsterdam, Netherlands.
- Cheng CF Department of Physics and Astronomy, LaserLaB, Vrije Universiteit Amsterdam, de Boelelaan 1081, 1081 HV Amsterdam, Netherlands.
- Salumbides EJ Department of Physics and Astronomy, LaserLaB, Vrije Universiteit Amsterdam, de Boelelaan 1081, 1081 HV Amsterdam, Netherlands.
- Eikema KSE Department of Physics and Astronomy, LaserLaB, Vrije Universiteit Amsterdam, de Boelelaan 1081, 1081 HV Amsterdam, Netherlands.
- Ubachs W Department of Physics and Astronomy, LaserLaB, Vrije Universiteit Amsterdam, de Boelelaan 1081, 1081 HV Amsterdam, Netherlands.
- Jungen C Department of Physics and Astronomy, University College London, London WC1E 6BT, United Kingdom.
- Merkt F Laboratorium für Physikalische Chemie, ETH Zürich, 8093 Zürich, Switzerland.
- 2019-11-09
Published in:
- Physical review letters. - 2019
English
Nuclear-spin-symmetry conservation makes the observation of transitions between quantum states of ortho- and para-H_{2} extremely challenging. Consequently, the energy-level structure of H_{2} derived from experiment consists of two disjoint sets of level energies, one for para-H_{2} and the other for ortho-H_{2}. We use a new measurement of the ionization energy of para-H_{2} [E_{I}(H_{2})/(hc)=124 417.491 098(31) cm^{-1}] to determine the energy separation [118.486 770(50) cm^{-1}] between the ground states of para- and ortho-H_{2} and thus link the energy-level structure of the two nuclear-spin isomers of this fundamental molecule. Comparison with recent theoretical results [M. Puchalski et al., Phys. Rev. Lett. 122, 103003 (2019)PRLTAO0031-900710.1103/PhysRevLett.122.103003] enables the derivation of an upper bound of 1.5 MHz for a hypothetical global shift of the energy-level structure of ortho-H_{2} with respect to that of para-H_{2}.
- Language
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- English
- Open access status
- green
- Identifiers
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- DOI 10.1103/PhysRevLett.123.163002
- PMID 31702363
- Persistent URL
- https://sonar.ch/global/documents/185182
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