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Determination of the Interval between the Ground States of Para- and Ortho-H_{2}.

08:00 EDT 18th October 2019 | BioPortfolio

Summary of "Determination of the Interval between the Ground States of Para- and Ortho-H_{2}."

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}.

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This article was published in the following journal.

Name: Physical review letters
ISSN: 1079-7114
Pages: 163002

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Medical and Biotech [MESH] Definitions

Benzene derivatives which are substituted with two nitro groups in the ortho, meta or para positions.

Any of three isomeric compounds (ortho-, meta-, and para-) containing a benzene ring with a methyl and amino group attached to it. They are suspected CARCINOGENS.

Includes ortho-, meta-, and para-nitrophenylgalactosides.

Compounds consisting of three benzene rings linked to each other in either ortho, meta or para positions and substituted with chlorine atoms.

Compounds consisting of benzene rings linked to each other in either ortho, meta or para positions. Permitted are any substitutions, but ring fusion to any of the benzene rings is not allowed.

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