Back ground gas induced collision shift for 88Sr: 1S0-3P1 transition

Precision saturation absorption spectroscopy on a vapor cell was performed for ⁸⁸Sr ¹S₀ - ³P¹ spin-forbidden transition. Various kinds of rare gas were introduced into the cell as buffer gas (BG) and the collision shift due to the BG was detected at ~kHz level. The results and theory to validate the experiment may help to correctly estimate the influence on state-of-the-art lattice clocks whose clock transition ¹S₀ - ³P¹ is similar to the transition investigated here.