TY - JOUR

T1 - Rotational and near-infrared spectra of PbF: Characterization of the coupled X1 Π1/2 2 and X2 Π3/2 2 states

AU - Jackson, S.

AU - Kim, L.

AU - Biekert, A.

AU - Nguyen, A.

AU - Mawhorter, R.J.

AU - Sears, T.J.

AU - Skripnikov, L.V.

AU - Baturo, V.V.

AU - Petrov, A.N.

AU - Grabow, J.-U.

N1 - Export Date: 27 October 2024 Сведения о финансировании: U.S. Department of Energy, USDOE Сведения о финансировании: Office of Science, SC Сведения о финансировании: Chemical Sciences, Geosciences, and Biosciences Division, CSGB Сведения о финансировании: Basic Energy Sciences, BES, DE-SC0018950 Сведения о финансировании: Deutsche Forschungsgemeinschaft, DFG, GR1344/11-1 Сведения о финансировании: Russian Science Foundation, RSF, 24-12-00092 Текст о финансировании 1: S.J., L.K., A.B., A.N., and R.J.M. thank fellow student Jos\u00E9 Mu\u00F1oz-Lopez for assistance taking data. They also appreciate research support provided by a Pomona College Sontag Fellowship as well as Hirsch Research Initiation and Summer Undergraduate Research Program grants. Ewald Fink and Klaus Setzer from Wuppertal are acknowledged for kindly sharing their unpublished data. T.J.S. acknowledges support by the U.S. Department of Energy, Office of Science, Division of Chemical Sciences, Geosciences, and Biosciences within the Office of Basic Energy Sciences, under Grant No. DE-SC0018950, for part of this work. J.-U.G. acknowledges support from the Deutsche Forschungsgemeinschaft under Grant No. GR1344/11-1 and from the Land Niedersachsen. Calculations of sensitivity to variation of fundamental constants and to electron electric dipole moment are supported by the Russian Science Foundation under Grant No. 24-12-00092.

PY - 2024/10/9

Y1 - 2024/10/9

N2 - Observations of the rotational spectrum of lead monofluoride, PbF, have been extended up to transitions in the v = 7 level for PbF208 in the lowest X1Π1/22 state of the radical and v = 5 for the Pb207 and Pb206 isotopologs. The data also include a few measurements for PbF204 at v = 0. These new measurements have been combined with existing near-IR measurements of the X2-X1 fine-structure transition and a simultaneous multi-isotope fit of the data to an effective isotope-independent rovibronic Hamiltonian has been carried out. The resulting parameters fully characterize the vibrational, rotational, and hyperfine structure of the combined X1/X2 state of the radical. A pair of opposite-parity levels with total angular momentum quantum number, F=1/2, in the lowest rotational level, J=1/2, of PbF207 are close in energy and their spacing decreases with vibrational excitation. The experimental results show the spacing decreases to less than 20 MHz at v=7 and 8. The experimental work is complemented by new ab initio calculations which support the results and allow predictions outside the experimental data range. The calculated radiative lifetimes of the relevant vibrationally excited states are of the order of 50 ms. This paper was motivated by interest in using PbF207 as a vehicle for future probes of the standard model of physics such as placing limits on the electrons electric dipole moment (eEDM), eEDM calibration, molecular charge-parity nonconservation, and Born-Oppenheimer breakdown effects for example. © 2024 American Physical Society.

AB - Observations of the rotational spectrum of lead monofluoride, PbF, have been extended up to transitions in the v = 7 level for PbF208 in the lowest X1Π1/22 state of the radical and v = 5 for the Pb207 and Pb206 isotopologs. The data also include a few measurements for PbF204 at v = 0. These new measurements have been combined with existing near-IR measurements of the X2-X1 fine-structure transition and a simultaneous multi-isotope fit of the data to an effective isotope-independent rovibronic Hamiltonian has been carried out. The resulting parameters fully characterize the vibrational, rotational, and hyperfine structure of the combined X1/X2 state of the radical. A pair of opposite-parity levels with total angular momentum quantum number, F=1/2, in the lowest rotational level, J=1/2, of PbF207 are close in energy and their spacing decreases with vibrational excitation. The experimental results show the spacing decreases to less than 20 MHz at v=7 and 8. The experimental work is complemented by new ab initio calculations which support the results and allow predictions outside the experimental data range. The calculated radiative lifetimes of the relevant vibrationally excited states are of the order of 50 ms. This paper was motivated by interest in using PbF207 as a vehicle for future probes of the standard model of physics such as placing limits on the electrons electric dipole moment (eEDM), eEDM calibration, molecular charge-parity nonconservation, and Born-Oppenheimer breakdown effects for example. © 2024 American Physical Society.

KW - Electric dipole moments

KW - Free radical reactions

KW - Infrared radiation

KW - Near infrared spectroscopy

KW - Strain measurement

KW - Electron electric dipole moment

KW - Fine structure transitions

KW - IR measurements

KW - Isotopolog

KW - Measurements of

KW - Near infrared spectra

KW - Near-IR

KW - Rotational spectra

KW - Rotational structures

KW - Vibrational structures

KW - Hamiltonians

UR - https://www.mendeley.com/catalogue/1f54a655-84ce-3337-b690-b97a91d27bea/

U2 - 10.1103/physreva.110.042808

DO - 10.1103/physreva.110.042808

M3 - статья

VL - 110

SP - 042808

JO - Physical Review A - Atomic, Molecular, and Optical Physics

JF - Physical Review A - Atomic, Molecular, and Optical Physics

SN - 1050-2947

IS - 4

ER -