Cesium, Recent Measurements

 

  1.   1999, Pritchard, et al obtained in amu
    MCs=132.905 451 931(27) or 200 ppt

  2.   1999, Hänsch, et al obtained
    fCs(D1)=335.116 048 807(41) THz or 120 ppt

  3.   This was the first phase-coherent optical frequency measurement with ultrashort light pulses (femtosecond laser).

  4.  

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