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Ro-Vibrational Spectrum of Vanadium Monoxide (VO) at 10 μm.
J Phys Chem A
January 2025
Institute of Physics, University of Kassel, Heinrich-Plett Str. 40, 34132 Kassel, Germany.
The high resolution ro-vibrational spectrum of the diatomic molecule vanadium oxide (VO) in the gas phase was measured around 1000 cm. In total, 1529 ro-vibrational transitions were assigned, in a spectral range of 984-1036 cm. For many transitions, the hyperfine structure resulting from the nuclear spin of V were resolved and the molecular parameters for the first ( = 1) and second ( = 2) excited vibrational state of VO were derived.
View Article and Find Full Text PDFThe thorium isomer Th: review of status and perspectives after more than 50 years of research.
Eur Phys J Spec Top
January 2024
Faculty of Physics, Ludwig-Maximilians-Universität München, Am Coulombwall 1, Garching, 85748 Germany.
Article Synopsis
- Today's precise timekeeping relies on optical atomic clocks, but nuclear clocks, using nuclear transitions, could offer enhanced accuracy for various scientific applications.
- The elusive "Thorium Isomer" (Th) is a potential candidate for a nuclear clock, which has been under investigation for decades but only recently confirmed through direct detection in 2016.
- Significant advances in characterizing Th's properties have been made, including determining its half-life and excitation energy, culminating in the first observation of its radiative decay, paving the way for further developments in precise timekeeping.
Spectroscopic characterization of buffer-gas-cooled lead monofluoride molecules in the BΣ(υ' = 0) ← XΠ(υ = 0) transition.
Spectrochim Acta A Mol Biomol Spectrosc
November 2024
State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200062, PR China; Xinjiang Astronomical Observatory, Chinese Academy of Sciences, 150 Science 1 - Street, Urumqi, Xinjiang 830011, PR China; Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, Shanxi 030006, PR China. Electronic address:
Establishing a nonzero measurement of the electron Electric Dipole Moment (eEDM) has long been a fundamental pursuit in atomic, molecular and optical physics, offering possible insights into new physics beyond the Standard Model. In this regard, lead monofluoride (PbF) has emerged as a potential candidate for measuring eEDM primarily due to its suitable properties such as the strong internal effective electric field, and eEDM-sensitive ground state with large Ω-doubling and small magnetic g factor. In the present work, we realized the production of a buffer-gas-cooled PbF molecular beam and characterized its high-resolution spectroscopy in the BΣ(υ'=0) ← XΠ(υ = 0) transition, including both direct absorption and laser-induced fluorescence spectroscopy.
View Article and Find Full Text PDFA comparison of pulse and CW EPR T-relaxation measurements of an inhomogeneously broadened nitroxide spin probe undergoing Heisenberg spin exchange 2. The intercept discrepancy.
J Magn Reson
November 2024
Zavoisky Physical-Technical Institute, Russian Academy of Sciences, Sibirsky trakt 10/7, Kazan 420029, Russian Federation.
Experimental confirmation of a theoretical prediction of a non-linear broadening of the spin packets of nitroxide free radicals due to Heisenberg spin exchange at low concentrations, C, is presented. A recent demonstration that spectra with resolved proton hyperfine structure may be analyzed efficiently and accurately was utilized to confirm the theory. As C→0, a plot of the spin-packet line width (SPW) curves downward due to the presence of proton hyperfine couplings that increase the number of distinguishable quantum spin states.
View Article and Find Full Text PDFCoupled internal rotations and 14N quadrupole hyperfine structure of 2,4-dimethylpyrrole investigated by microwave spectroscopy and quantum chemistry.
J Chem Phys
June 2024
Univ Paris Est Creteil and Université Paris Cité, CNRS, LISA, F-94010 Créteil, France.
The microwave spectrum of 2,4-dimethylpyrrole was investigated using a Fourier-transform microwave spectrometer in a supersonic expansion. Torsional splittings arising from two inequivalent methyl internal rotors in combination with hyperfine splittings due to the nuclear quadrupole coupling of the 14N nucleus were observed. The experiments were accompanied by quantum chemical calculations.
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