A clock transition for a future optical frequency standard with trapped atoms

Details A clock transition for a future optical frequency standard with trapped atoms A clock transition for a future optical frequency standard with trapped atoms

2003-03-06

arxiv.org/abs/physics/0303023v1

Phys. Rev. A 68, 030501(R) (2003)

Physics

Atomic Physics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevA.68.030501

We report the first direct excitation of the strongly forbidden 5s2 1S0-5s5p 3P0 transition in 87Sr. Its frequency is 429 228 004 235 (20) kHz. A resonant laser creates a small leak in a magneto-optical trap (MOT): atoms build up to the metastable 3P0 state and escape the trapping process, leading to a detectable decrease in the MOT fluorescence. This line has a natural width of 10^{-3} Hz and can be used for a new generation of optical frequency standards using atoms trapped in a light shift free dipole trap.

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