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

Kód výsledku v 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>

Nalezeny alternativní kódy

RIV/00216208:11320/16:10334286

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

CF - Fyzikální chemie a teoretická chemie

OECD FORD obor

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Projekt

<a href="/cs/project/GA15-10267S" target="_blank" >GA15-10267S: Molekulární procesy ve vesmíru</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2016

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Physical Review A

ISSN

2469-9926

e-ISSN

—

Svazek periodika

93

Číslo periodika v rámci svazku

5

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

5

Strana od-do

—

Kód UT WoS článku

000375984800007

EID výsledku v databázi Scopus

2-s2.0-84966364940