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Limit on the cosmological variation of mp/me from the inversion spectrum of ammonia.
We obtain the limit on the space-time variation of the ratio of the proton mass to the electron mass, mu=m(p)/m(e), based on comparison of quasar absorption spectra of NH3 with CO, HCO+ and HCN
Methanol as A Tracer of Fundamental Constants
The methanol molecule CH{sub 3}OH has a complex microwave spectrum with a large number of very strong lines. This spectrum includes purely rotational transitions as well as transitions with
Blackbody-radiation shift in the Sr optical atomic clock
We evaluated the static and dynamic polarizabilities of the $5{s}^{2}\phantom{\rule{0.16em}{0ex}}{}^{1}{S}_{0}$ and $5s5p\phantom{\rule{0.16em}{0ex}}{}^{3}{P}_{0}^{o}$ states of Sr using the
A search for varying fundamental constants using hertz-level frequency measurements of cold CH molecules
TLDR
A spectroscopic method for pulsed beams of cold molecules is developed, and it is used to measure the frequencies of microwave transitions in CH with accuracy down to 3 Hz, to test the hypothesis that fundamental constants may differ between the high- and low-density environments of the Earth and the interstellar medium.
A new approach for testing variations of fundamental constants over cosmic epochs using FIR fine-structure lines
Aims. We aim to obtain limits on the variation of the fine-structure constant α and the electron-to-proton mass ratio μ over different cosmological epochs. Methods. A new approach based on the
Searching for chameleon-like scalar fields with the ammonia method , II. Mapping of cold molecular cores in NH3 and HC3N lines
Context. In our previous work we found a statistically significant offset ΔV ≈ 27 m s −1 between the radial velocities of the HC3N J = 2− 1a nd NH 3 (J,K) = (1, 1) transitions observed in molecular
An upper limit to the variation in the fundamental constants at redshift z = 5.2
Aims. We constrain a hypothetical variation in the fundamental physical constants over the course of cosmic time. Methods. We use unique observations of the CO(7-6) rotational line and the (Ci) 3 P2
ELECTRIC-DIPOLE AMPLITUDES, LIFETIMES, AND POLARIZABILITIES OF THE LOW-LYING LEVELS OF ATOMIC YTTERBIUM
Centre for Optics and Atomic Physics, Sussex University, Falmer, Brighton BN1 9QH, United Kingdom~Received 2 March 1999!The results of ab initio calculations of electric-dipole amplitudes, lifetimes,
Λ -doublet spectra of diatomic radicals and their dependence on fundamental constants
$\Lambda$-doublet spectra of light diatomic radicals have high sensitivity to the possible variations of the fine structure constant alpha and electron-to-proton mass ratio beta. For molecules OH and
SENSITIVITY OF THE H3O+ INVERSION-ROTATIONAL SPECTRUM TO CHANGES IN THE ELECTRON-TO-PROTON MASS RATIO
Quantum-mechanical tunneling inversion transition in ammonia (NH3) is actively used as a sensitive tool to study possible variations of the electron-to-proton mass ratio, μ = m e/m p. The molecule
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