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 Title: AN ELECTRONIC SPECTROSCOPIC STUDY OF A MOLECULAR BEAM SAMPLE OF YbOH Author(s): Steimle, Timothy Contributor(s): Hutzler, Nicholas R; Pilgram, Nickolas Subject(s): Metal containing Abstract: Ytterbium monofluoride, YbF, has long been used as a venue in attempts to measure the electron electric dipole moment (eEDM)\footnote{Hudson, J. J.; Sauer, B. E.; Tarbutt, M. R.; Hinds, E. A., Measurement of the Electron Electric Dipole Moment Using YbF Molecules. Phys. Rev. Lett. 2002, 89 (2), 023003/1-023003/4.}\footnote{Tarbutt, M. R.; Sauer, B. E.; Hudson, J. J.; Hinds, E. A., Design for a fountain of YbF molecules to measure the electron's electric dipole moment. New J. Phys. 2013, 15 (May), 053034/1-053034/17.} . In addition to the molecular EDM resulting from the eEDM contribution, the $^{173}$Yb(16.1\%, I=5/2) isotopic form of Yb-containing molecules are also expected to have an EDM caused by an interaction of a nuclear magnetic quadrupole moment (NMQM)\footnote{Lackenby, B. G. C.; Flambaum, V. V., Weak quadrupole moment, quadrupole distribution of neutrons and Lorentz invariance violation in deformed nuclei. arXiv.org, e-Print Arch., Nucl. Theory 2017, 1-7.} with the electrons. As pointed out by Kozyryev and Hutzler\footnote{Kozyryev, I.; Hutzler, N. R., Precision measurement of time-reversal symmetry violation with laser-cooled polyatomic molecules. arXiv.org, e-Print Arch., Phys. 2017, 1-11.}, certain energy levels of Yb-polyatomic molecules (e.g. YbOH, YbCCH, YbCH$_{3}$, and YbOCH$_{3}$) are expected to exhibit enhanced sensitivity for EDM measurements, relative to YbF, largely due to their ease of polarization. The properties of such molecules are poorly characterized. Here we report on our initial molecular beam studies of the known\footnote{Melville, T. C.; Coxon, J. A., The visible laser excitation spectrum of YbOH: The A$^{2}$$\Pi$$_{1/2}$(000) - X$^{2}$$\Sigma$$^{+}$(000) transition. J. Chem. Phys. 2001, 115 (15), 6974-6978.} A$^{2}$$\Pi$$_{1/2}$(000) - X$^{2}$$\Sigma$$^{+}$(000) transition of YbOH. The high-resolution (~30 MHz) laser induced fluorescence (LIF) spectrum in the 17320 cm$^{-1}$ to 17326 cm$^{-1}$ range was recorded both field-free and in the presence of a static electric field. Stark spectra were analyzed to determine the molecular frame permanent electric dipole moments, $\mu$$_{el}, for the A^{2}$$\Pi$$_{1/2} and X^{2}$$\Sigma$$^{+}$ states. The dispersed fluorescence resulting from the excitation of rotationally resolved branch features has been analyzed to produce fluorescence branching ratios. Implications for planned EDM measurements will be presented. Issue Date: 06/20/18 Publisher: International Symposium on Molecular Spectroscopy Citation Info: APS Genre: Conference Paper / Presentation Type: Text Language: English URI: http://hdl.handle.net/2142/100667 DOI: 10.15278/isms.2018.WF04 Other Identifier(s): WF04 Date Available in IDEALS: 2018-08-172018-12-12
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