Details
| Original language | English |
|---|---|
| Article number | 042808 |
| Journal | Physical Review A |
| Volume | 110 |
| Issue number | 4 |
| Early online date | 9 Oct 2024 |
| Publication status | Published - Oct 2024 |
Abstract
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.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Atomic and Molecular Physics, and Optics
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In: Physical Review A, Vol. 110, No. 4, 042808, 10.2024.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Rotational and near-infrared spectra of PbF
T2 - Characterization of the coupled X1 Π1/2 2 and X2 Π3/2 2 states
AU - Jackson, Sean
AU - Kim, Luke
AU - Biekert, Andreas
AU - Nguyen, Alex
AU - Mawhorter, Richard J.
AU - Sears, Trevor J.
AU - Skripnikov, Leonid V.
AU - Baturo, Vera V.
AU - Petrov, Alexander N.
AU - Grabow, Jens Uwe
N1 - Publisher Copyright: © 2024 American Physical Society.
PY - 2024/10
Y1 - 2024/10
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.
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.
UR - http://www.scopus.com/inward/record.url?scp=85206618841&partnerID=8YFLogxK
U2 - 10.1103/PhysRevA.110.042808
DO - 10.1103/PhysRevA.110.042808
M3 - Article
AN - SCOPUS:85206618841
VL - 110
JO - Physical Review A
JF - Physical Review A
SN - 2469-9926
IS - 4
M1 - 042808
ER -