Erlangen 2018 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 7: High Resolution Spectroscopy
MO 7.5: Vortrag
Montag, 5. März 2018, 17:15–17:30, PA 1.150
Probing a possible variation of the proton-to-electron mass ratio in the hyperfine-structure of ammonia, a theoretical study — •Andrei Duchko1,4, Alec Owens1,2, Andrey Yachmenev1,2, and Jochen Küpper1,2,3,4 — 1Center for Free-Electron Laser Science, DESY, Hamburg, Germany — 2Center for Ultrafast Imaging, Universität Hamburg, Germany — 3Department of Physics, Universität Hamburg, Germany — 4Department of Chemistry, Universität Hamburg, Germany
In this study we investigate a possible variation of the proton-to-electron mass ratio (µ) in the hyperfine transitions of the rovibrational spectrum of ammonia. The rovibrational spectrum has been computed variationally using the program suite TROVE [1,2], a new spectroscopically determined potential energy surface [3], and ab initio quadrupole [2], spin-spin, and spin-rotation coupling surfaces. The computed spectrum covers transitions between levels with rotational excitations up to J = 15 and vibrational band centers up to 8000 cm−1 above the zero point energy. Comparison with experimental data confirms the high accuracy of the computed results, which is essential for modeling the hyperfine-resolved high-resolution spectra. We will present an extensive analysis of the µ-variation sensitivity coefficients of hyperfine transitions of ammonia in the microwave and infrared spectral regions.
[1] Yurchenko S. N., Thiel W., Jensen P., 2007, J. Mol. Spectrosc., 245, 126. [2] Yachmenev A., Küpper J., 2017, J. Chem. Phys., 147, 141101. [3] Coles, P., Yurchenko, S. N., Tennyson, J., 2017, in preparation