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Frequency of the ultranarrow <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mmultiscripts><mml:mi>S</mml:mi><mml:mn>0</mml:mn><mml:none /><mml:mprescripts /><mml:none /><mml:mn>1</mml:mn></mml:mmultiscripts><mml:mo>−</mml:mo><mml:mmultiscripts><mml:mi>P</mml:mi><mml:mn>2</mml:mn><mml:none /><mml:mprescripts /><mml:none /><mml:mn>3</mml:mn></mml:mmultiscripts></mml:mrow></mml:math> transition in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts…
We determine the frequency of the ultranarrow $^{87}\mathrm{Sr}\phantom{\rule{4pt}{0ex}}^{1}S_{0}\ensuremath{-}^{3}P_{2}$ transition by spectroscopy of an ultracold gas. This transition is referenced to four molecular iodine lines that are observed by Doppler-free saturation spectroscopy of hot iodine vapor. The frequency differences between the Sr and the ${\mathrm{I}}_{2}$ transitions are measured with an uncertainty …