Publication | Open Access

Improved measurement of the hyperfine structure of the laser cooling level $$4f^{12}(^3H_6)5d_{5/2}6s^2$$ 4 f 12 ( 3 H 6 ) 5 d 5 / 2 6 s 2 $$(J=9/2)$$ ( J = 9 / 2 ) in $${}^{169}_{\,\,69}{{\mathrm {Tm}}}$$ 69 169 Tm