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Yerokhin","submitted_at":"2012-01-06T08:05:16Z","abstract_excerpt":"We measure the absolute frequency of seven out of the nine allowed transitions between the 2$^3${\\it S} and 2$^3${\\it P} hyperfine manifolds in a metastable $^3$He beam by using an optical frequency comb synthesizer-assisted spectrometer. The relative uncertainty of our measurements ranges from $1\\times 10^{-11}$ to $5\\times 10^{-12}$, which is, to our knowledge, the most precise result for any optical $^3$He transition to date. The resulting $2^3${\\it P}-2$^3${\\it S} centroid frequency is $276\\,702\\,827\\,204.8\\,(2.4)$kHz. 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