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  Enhanced sensitivity to a possible variation of the proton-to-electron mass ratio in ammonia

Owens, A., Yurchenko, S. N., Thiel, W., & Špirko, V. (2016). Enhanced sensitivity to a possible variation of the proton-to-electron mass ratio in ammonia. Physical Review A, 93(5), 052506/1-052506/5. doi:10.1103/PhysRevA.93.052506.

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SM_enhanced_2v2_v4_NH3.pdf (Supplementary material), 235KB
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SM_enhanced_2v2_v4_NH3.pdf
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Owens, Alec1, 2, Author              
Yurchenko, S. N.2, Author
Thiel, Walter1, Author              
Špirko, V.3, 4, Author
Affiliations:
1Research Department Thiel, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445590              
2Department of Physics and Astronomy, University College London, Gower Street, WC1E 6BT London, United Kingdom, ou_persistent22              
33Academy of Sciences of the Czech Republic, Institute of Organic Chemistry and Biochemistry, Flemingovo n´am. 2, 166 10 Prague 6, Czech Republic, ou_persistent22              
44Department of Chemical Physics and Optics, Faculty of Mathematics and Physics, Charles University in Prague, Ke Karlovu 3, CZ-12116 Prague 2, Czech Republic, ou_persistent22              

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 Abstract: Numerous accidental near degeneracies exist between the 2ν2 and ν4 rotation-vibration energy levels of ammonia. Transitions between these two states possess significantly enhanced sensitivity to a possible variation of the proton-to-electron mass ratio μ. Using a robust variational approach to determine the mass sensitivity of the energy levels along with accurate experimental values for the energies, sensitivity coefficients have been calculated for over 350 microwave, submillimeter, and far-infrared transitions up to J=15 for 14NH3. The sensitivities are the largest found in ammonia to date. One particular transition, although extremely weak, has a sensitivity of T=−16738 and illustrates the huge enhancement that can occur between close-lying energy levels. More promising however are a set of previously measured transitions with T=−32 to 28. Given the astrophysical importance of ammonia, the sensitivities presented here confirm that 14NH3 can be used exclusively to constrain a spatial or temporal variation of μ. Thus certain systematic errors which affect the ammonia method can be eliminated. For all transitions analyzed we provide frequency data and Einstein A coefficients to guide future laboratory and astronomical observations.

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Language(s): eng - English
 Dates: 2016-02-042016-05-092016
 Publication Status: Published in print
 Pages: 5
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1103/PhysRevA.93.052506
 Degree: -

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Title: Physical Review A
  Other : Phys. Rev. A
  Other : Physical Review A: Atomic, Molecular, and Optical Physics
Source Genre: Journal
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Publ. Info: New York, NY : American Physical Society
Pages: - Volume / Issue: 93 (5) Sequence Number: - Start / End Page: 052506/1 - 052506/5 Identifier: ISSN: 1050-2947
CoNE: https://pure.mpg.de/cone/journals/resource/954925225012_2