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THE EFFECTIVE HAMILTONIAN FOR THE GROUND STATE OF $^{207}Pb^{19}F$ AND NEW MEASUREMENTS OF THE FINE STRUCTURE SPECTRUM NEAR 1.2 $\mu m$.

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/49270

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Title: THE EFFECTIVE HAMILTONIAN FOR THE GROUND STATE OF $^{207}Pb^{19}F$ AND NEW MEASUREMENTS OF THE FINE STRUCTURE SPECTRUM NEAR 1.2 $\mu m$.
Creators: Mawhorter, Richard; Murphey, Benjamin; Baum, Alexander; Sears, Trevor J.; Yang, T. Zh.; Rupasinghe, P. M.; McRaven, C. P.; Shafer-Ray, N. E.; Alphei, Lukas D.; Grabow, Jens-Uwe
Issue Date: 2011
Abstract: We have measured rotational transitions in the ground, $X_1~^2\Pi_{1/2}$, electronic state of naturally occuring isotopomers of PbF in a supersonic free jet Fourier transform microwave spectrometer. The data for $^{207}Pb^{19}F$ is particularly interesting because it is a candidate for a future experimental e-EDM measurement. To fit the data for this species to the measurement precision, the nuclear spin-spin dipolar interaction and a second term that can be equivalently viewed as a centrifugal distortion correction to the familiar Frosch and Foley hyperfine coupling terms, or an $\Omega-$ dependent correction to the nuclear spin-rotational coupling are required, in addition to the standard terms. To characterize the higher $X_2~^2\Pi_{3/2}$ component of the ground state of PbF, we are attempting a direct measurement of transitions between the two components in a slit jet-cooled sample using a frequency comb-referenced extended cavity diode laser. This spectrum was originally detected in a hot source by Fourier transform near-infrared spectroscopy, nderline{\textbf{191}}, 108 1998.} but low$-J$ transitions were unresolved at that time. Acknowledgments: Work at Brookhaven National Laboratory was carried out under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy. Work by N. E. Shafer-Ray was performed with support from the National Science Foundatation award NSF-0855431. J.-U. Grabow ackonwledges funding from the Deutsche Forschungsgemeinschaft and the Land Niedersachsen.
URI: http://hdl.handle.net/1811/49270
Other Identifiers: 2011-RA-06
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