Lifetime measurement of the 3d9 2D3/2 metastable level in Mo15+ at an electron beam ion trap

An experimental measurement of the lifetime of 3d9 2D3/2 metastable level in Mo15+is reported in this work.The Mo15+ions are produced and trapped in an electron beam ion trap with a magnetic field of 0.65 T.The decay photons emitted from 3d9 2D3/2 level are subsequently recorded via a cooled photomultiplier tube.Through meticulous scrutiny of potential systematic uncertainties affecting the measurement outcomes,we have determined the lifetime of Mo15+3d92D3/2 metastable level to be 2.83(22)ms.The experimental result provides a clear distinguishment from existing calcula-tions based on various theoretical approaches.