Accurate prediction of the ammonia probes of a variable proton-to-electron mass ratio

0445795 - ÚOCHB 2016 RIV GB eng J - Journal Article
Owens, A. - Yurchenko, S. N. - Thiel, W. - Špirko, Vladimír
Accurate prediction of the ammonia probes of a variable proton-to-electron mass ratio.
Monthly Notices of the Royal Astronomical Society. Roč. 450, č. 3 (2015), s. 3191-3200. ISSN 0035-8711. E-ISSN 1365-2966
Grant - others:GA ČR(CZ) GA15-10267S
Institutional support: RVO:61388963
Keywords : molecular data * cosmological parameters * infrared: ISM * submillimetre: ISM
Subject RIV: CF - Physical ; Theoretical Chemistry
Impact factor: 4.952, year: 2015

A comprehensive study of the mass sensitivity of the vibration-rotation-inversion transitions of (NH3)-N-14, (NH3)-N-15, (ND3)-N-14 and (ND3)-N-15 is carried out variationally using the trove approach. Variational calculations are robust and accurate, offering a new way to compute sensitivity coefficients. Particular attention is paid to the Delta k = +/- 3 transitions between the accidentally coinciding rotation-inversion energy levels of the nu(2) = 0(+), 0(-), 1(+) and 1(-) states, and the inversion transitions in the nu(4) = 1 state affected by the 'giant' l-type doubling effect. These transitions exhibit highly anomalous sensitivities, thus appearing as promising probes of a possible cosmological variation of the proton-to-electron mass ratio mu. Moreover, a simultaneous comparison of the calculated sensitivities reveals a sizeable isotopic dependence which could aid an exclusive ammonia detection.
Permanent Link: http://hdl.handle.net/11104/0247845