Buffer gas induced collision shift for the \(^{88}\)Sr \(\bf{^1S_0-^3P_1}\) clock transition

• Published in: arXiv.org 2009-07
• Main Authors: Shiga, Nobuyasu, Li, Ying, Ito, Hiroyuki, Nagano, Shigeo, Ido, Tetsuya, Bielska, Katarzyna, Trawiński, Ryszard S, Ciuryło, Roman
• Format: Article
• Language: English
• Subjects: Buffers; Gas pressure; Helium; Optical lattices; Rare gases
• ISSN: 2331-8422
• DOI: 10.48550/arxiv.0907.0904

Precision saturation spectroscopy of the \(^{88}{\rm Sr} ^1S_0-^3P_1\) is performed in a vapor cell filled with various rare gas including He, Ne, Ar, and Xe. By continuously calibrating the absolute frequency of the probe laser, buffer gas induced collision shifts of \(\sim \)kHz are detected with gas pressure of 1-20 mTorr. Helium gave the largest fractional shift of \(1.6 \times 10^{-9} {\rm Torr}^{-1}\). Comparing with a simple impact calculation and a Doppler-limited experiment of Holtgrave and Wolf [Phys. Rev. A {\bf 72}, 012711 (2005)], our results show larger broadening and smaller shifting coefficient, indicating effective atomic loss due to velocity changing collisions. The applicability of the result to the \(^1S_0-^3P_0\) optical lattice clock transition is also discussed.