Evaluation of variation in (mp/me) from the frequency difference between the 15N2+ and 87Sr transitions
Evaluation of variation in (mp/me) from the frequency difference between the 15N2+ and 87Sr transitions
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根据 15N2 和 87Sr 跃迁之间的频率差评估 (mp/me) 的变化
DOI：
10.1007/s00340-016-6479-8
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Masatoshi Kajita
中科院分区：
文献类型：
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作者：
Makoto Yamashita;Shinya Kato;Atsushi Yamaguchi;Seiji Sugawa;Takeshi Fukuhara;Satoshi Uetake;and Yoshiro Takahashi;Masatoshi Kajita
跃迁频率（429 THz）的不确定度已降低到.此外，预计振动跃迁频率的测量不确定度为，并且v = 0-7跃迁频率（422 THz）与跃迁频率接近。在本文中，我们提出了一个测试的变化，质子与电子的质量ratio通过精确测量这些transition frequencies之间的差异。通过在的不确定度内测量，可以检测到的变化。跃迁频率不受塞曼和电四极移的影响。直流斯塔克系数约为，用弦晶体中的分子离子测量的不确定度低于。跃迁频率是通过波长为1422 nm的激光（激光A）的双光子激发观察到的。另一个波长为1396 nm的激光器（激光器B）被用作倍频后的锁频激光器。应使用频率梳测量激光器A和B之间的频率差（3.5 THz）。激光器A和B可通过光纤传输到另一个实验室。因此，可以在两个相距遥远的实验室之间合作进行变异的敏感试验。
The uncertainty of thetransition frequency (429 THz) has been reduced to the level of. Also, thevibrational transition frequency is expected to be measured with an uncertainty of, and thev= 0–7 transition frequency (422 THz) is close to thetransition frequency. In this paper, we propose a test for the variation in the proton-to-electron mass ratiovia precise measurement of the differencebetween these transition frequencies. By measuringwithin the uncertainty of, a variation inofcan be detected. Thetransition frequency is free from Zeeman and electric quadrupole shifts. The dc Stark coefficient is about, and the measurement ofwith an uncertainty lower thanappears to be attainable using molecular ions in a string crystal. Thetransition frequency is observed via the two-photon excitation of a laser with a wavelength of 1422 nm (laser A). Another laser with a wavelength of 1396 nm (laser B) is used as aclock laser after frequency doubling. The frequency difference between lasers A and B (3.5 THz) should be measured using a frequency comb. Lasers A and B can be transferred to another laboratory via an optical fiber. Therefore, a sensitive test of the variation incan be performed in cooperation between two distant laboratories.