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

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61388963%3A_____%2F16%3A00461240" target="_blank" >RIV/61388963:_____/16:00461240 - isvavai.cz</a>
Alternative codes found
RIV/00216208:11320/16:10334286
Result on the web
<a href="http://dx.doi.org/10.1103/PhysRevA.93.052506" target="_blank" >http://dx.doi.org/10.1103/PhysRevA.93.052506</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/PhysRevA.93.052506" target="_blank" >10.1103/PhysRevA.93.052506</a>

Result language
angličtina
Original language name
Enhanced sensitivity to a possible variation of the proton-to-electron mass ratio in ammonia
Original language description
Numerous accidental near degeneracies exist between the 2.2 and.4 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 mu. 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 (NH3)-N-14. The sensitivities are the largest found in ammonia to date. One particular transition, although extremely weak, has a sensitivity of T = -16 738 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 (NH3)-N-14 can be used exclusively to constrain a spatial or temporal variation of mu. 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.
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
CF - Physical chemistry and theoretical chemistry
OECD FORD branch
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Project
<a href="/en/project/GA15-10267S" target="_blank" >GA15-10267S: Molecular processes in the Universe</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2016
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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