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Enhanced sensitivity to a possible variation of the proton-to-electron mass ratio in ammonia
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SYSNO ASEP 0461240 Druh ASEP J - Článek v odborném periodiku Zařazení RIV J - Článek v odborném periodiku Poddruh J Článek ve WOS Název Enhanced sensitivity to a possible variation of the proton-to-electron mass ratio in ammonia Tvůrce(i) Owens, A. (DE)
Yurchenko, S. N. (GB)
Thiel, W. (DE)
Špirko, Vladimír (UOCHB-X) ORCIDČíslo článku 052506 Zdroj.dok. Physical Review A. - : American Physical Society - ISSN 2469-9926
Roč. 93, č. 5 (2016)Poč.str. 5 s. Jazyk dok. eng - angličtina Země vyd. US - Spojené státy americké Klíč. slova precision measurements ; polyatomic molecules ; accurate prediction Vědní obor RIV CF - Fyzikální chemie a teoretická chemie Institucionální podpora UOCHB-X - RVO:61388963 UT WOS 000375984800007 EID SCOPUS 84966364940 DOI 10.1103/PhysRevA.93.052506 Anotace 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. Pracoviště Ústav organické chemie a biochemie Kontakt asep@uochb.cas.cz ; Kateřina Šperková, Tel.: 232 002 584 ; Jana Procházková, Tel.: 220 183 418 Rok sběru 2017
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