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Abstract. The caesium 6S1/2?8P1/2,3/2 transitions at 387.6nm and 388.8nm have been observed with a linewidth of 5MHz by laser spectroscopy. The absolute frequency of the 6S1/2?8P1/2 transition was determined to an uncertainty of 1MHz using the calibrated rubidium 5S1/2?5D5/2 two-photon transition and accurate interferometry. The potential of this caesium transition as a useful secondary frequency...
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