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We determine a lifetime of the 4/f 136s 2 (J = 5/2) clock level in 169Tm atoms trapped in an optical lattice at 532 nm directly exciting a 1.14 μm magneto-dipole transition and measuring a decay rate from this level to the ground (J = 7/2) state. The measured lifetime of 112(4) ms corresponds to a transition spectral line width of 1.4 Hz which is in a good agreement with a theoretical prediction of 1.14 Hz.

Measurement of the upper clock level lifetime in169Tm

Measurement of the upper clock level lifetime in¹⁶⁹Tm