Precision measurement of the isotope shifts of Sr by a laser cooling of a small quantity of ions in an ion trap.

这项研究的最初目的是测量锶原子核的同位素位移，但由于(1)欧洲一个小组最近用共线快光束激光光谱学测量了这些同位素位移，以及(2)发现不能使用覆盖1.09微米的激光冷却所需的半导体激光器，我们转向了对^&lt；87&gt；sr^+^2S&lt；1/2&gt；基态的超精细结构的精确测量。由于对整个系统进行了许多改进，包括同位素分离器，将其质量分离并植入陷阱内的铂丝上，S/N的性能提高了10倍。结果我们得到了与杂散磁场的塞曼效应进一步分裂的19条超精细结构相对应的锐利谱线，并可以明确地识别所谓的0-0线。经过对杂散场的二阶漂移的修正和Cs标准的校准，我们得到了^&lt；87&gt；sr^+^2s&lt；1/2&gt；A=-1,000,473,673*11赫兹的磁超精细常数A。该值对今后锶同位素超精细异常的研究具有重要意义，也将作为频率的次标准之一。

The initial aim of this research was the measurement of the isotope shifts of Sr nuclei, but because of (1) These isotope shifts were recently measured by an European group by co-linear fast-beam laser spectroscopy, and (2) Necessary diode lasers covering 1.09 mum light for laser cooling were found to be unavailable, we turned toward the precision measurement of the hyperfine structure of ^<87>Sr^+ ^2S_<1/2> ground state. Thanks to the many improvements of the whole system including the isotope separator to mass-separate and inplant onto a Pt filament inside the trap, the S/N became 10 times better. As the result we got sharp spectrum lines corresponding to the 19 lines of hyperfine structure which was further split by the Zeeman effect due to a stray magnetic field, and could identify the so-called 0 - 0 line unambiguously. We got, after correction of the 2nd-order shift sue to the stray field and calibration by a Cs standard, as the magnetic hyperfine constant A of ^<87>Sr^+^2S_<1/2> A=-1,000,473,673* 11 Hz. This value is important for future study of hyperfine anomalies of Sr isotopes, and also will serve as one of the sub-standards of frequency.