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- W4311184391 abstract "YbF has been identified as a molecule that can be used to investigate charge-parity symmetry violations that are beyond the standard model of particle physics. Cooling to sub-milli-Kelvin is advantageous for experiments that probe manifestations of these symmetry violations. One approach involves laser cooling of YbF via the ${A}^{2}{mathrm{ensuremath{Pi}}}_{1/2}ensuremath{-}{X}^{2}{mathrm{ensuremath{Sigma}}}^{+}$ transition. However, it appears that cooling by means of this transition may be limited by the radiative loss of population from the cooling cycle. YbF has low-energy states that arise from the ${mathrm{Yb}}^{+}(4{f}^{13}6{s}^{2}){mathrm{F}}^{ensuremath{-}}$ configuration. Recent theoretical calculations [C. Zhang et al., J. Mol. Spectrosc. 386, 111625 (2022)] predict that radiative decay from ${A}^{2}{mathrm{ensuremath{Pi}}}_{1/2}$ to the $4{f}^{13}6{s}^{2}$ states occurs with a branching fraction of approximately ${10}^{ensuremath{-}3}$. In the present study we have used dispersed laser induced fluorescence spectroscopy to observe the lowest energy $4{f}^{13}6{s}^{2}$ states. These measurements were carried out using excitation of previously unobserved YbF transitions in the near UV spectral range. An accurate ionization energy (IE) of $48phantom{rule{0.28em}{0ex}}703ifmmodepmelsetextpmfi{}5phantom{rule{0.28em}{0ex}}mathrm{c}{mathrm{m}}^{ensuremath{-}1}$ for YbF is also reported. A two-color photoionization technique was used to determine the IE and observe the ${v}^{+}=0text{ensuremath{-}}3$ vibrational levels of $mathrm{Yb}{mathrm{F}}^{+}phantom{rule{0.28em}{0ex}}{X}^{1}{mathrm{ensuremath{Sigma}}}^{+}$." @default.
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- W4311184391 date "2022-12-02" @default.
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- W4311184391 title "Direct observation of the <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mrow><mml:mi>Yb</mml:mi><mml:mo>(</mml:mo><mml:mrow><mml:mn>4</mml:mn><mml:msup><mml:mrow><mml:mi>f</mml:mi></mml:mrow><mml:mn>13</mml:mn></mml:msup><mml:mn>6</mml:mn><mml:msup><mml:mrow><mml:mi>s</mml:mi></mml:mrow><mml:mn>2</mml:mn></mml:msup></mml:mrow><mml:mo>)</mml:mo><mml:mi mathvariant=normal>F</mml:mi></mml:mrow></mml:math> states and accurate determination of the YbF ionization energy" @default.
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- W4311184391 doi "https://doi.org/10.1103/physreva.106.062804" @default.
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