Abstract
Time dilation constitutes a crucial aspect of Lorentz invariance within special relativity and undergoes constant scrutiny through numerous Ives-Stilwell-type experiments employing the Doppler effect. In our study, we employed optical Ramsey spectroscopy on a Li+ ion beam to enhance the precision of measuring the intrinsic transition frequency 23S1−23P2 to the level of four parts in 1010 with speed of 0.00035c. Our findings reconciled an existing 2 MHz disparity between collinear and perpendicular laser spectroscopy. Furthermore, in conjunction with previous studies on Li+ ion beams traveling at speeds of 0.064c and 0.338c [ Nat. Phys. 3, 861 (2007)NPAHAX1745-247310.1038/nphys778; Phys. Rev. Lett. 113, 120405 (2014)PRLTAO0031-900710.1103/PhysRevLett.113.120405], we updated the Robertson-Mansouri-Sexl parameter α^ to be (−10.0±9.9)×10−8 and (−2.9±2.0)×10−8, respectively.
Published Version
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