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High-resolution mid-infrared spectroscopy of buffer-gas-cooled methyltrioxorhenium molecules

Abstract : We demonstrate cryogenic buffer-gas cooling of gas-phase methyltrioxorhenium (MTO). This molecule is closely related to chiral organometallic molecules where the parity-violating energy differences between enantiomers may be measurable. The molecules are produced with a rotational temperature of approximately 6~K by laser ablation of an MTO pellet inside a cryogenic helium buffer gas cell. Facilitated by the low temperature, we demonstrate absorption spectroscopy of the 10.2~$\mu$m antisymmetric Re=O stretching mode of MTO with a resolution of 8~MHz and a frequency accuracy of 30~MHz. We partially resolve the hyperfine structure and measure the nuclear quadrupole coupling of the excited vibrational state.
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Submitted on : Friday, July 29, 2016 - 10:54:19 AM
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Sean K. Tokunaga, R. J. Hendricks, M. R. Tarbutt, B Darquié. High-resolution mid-infrared spectroscopy of buffer-gas-cooled methyltrioxorhenium molecules. New Journal of Physics, Institute of Physics: Open Access Journals, 2017, 19, pp.053006. ⟨10.1088/1367-2630/aa6de4⟩. ⟨hal-01348950⟩

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