25 August 2009 Background gas induced collision shift for a Sr spin-forbidden transition
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Buffer gas induced collision shift for the 88Sr 1S0-3P1 transition is investigated by precision saturation spectroscopy of thermal gas in a heat cell. The cell was filled with rare gases of helium, neon, argon, and xenon as buffer gases. Helium showed the largest fractional shift coefficient of 1.6x10-9 Torr-1. The disagreement between our experiments and simple impact calculations indicates effective atom losses from zero-velocity class which contributes to saturated absorption spectroscopy. The result could be useful to evaluate the background gas collision shift of Sr lattice clocks. Keywords: collision, saturated absorption spectroscopy, lattice clock, optical clock, density shift
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Tetsuya Ido, Nobuyasu Shiga, Ying Li, Hiroyuki Ito, Shigeo Nagano, Atsushi Yamaguchi, Michi Koide, Hiroshi Ishijima, Mizuhiko Hosokawa, Katarzyna Bielska, Roman Ciurylo, "Background gas induced collision shift for a Sr spin-forbidden transition", Proc. SPIE 7431, Time and Frequency Metrology II, 74310F (25 August 2009); doi: 10.1117/12.825471; https://doi.org/10.1117/12.825471

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