Time-of-flight (tof) signal of Re+ ions produced with the laser desorption ion source at two different kinetic energies: 20 keV (black) and 1 keV (grey). Both distributions result from the accumulation of 200 cycles. In order to observe them in the same panel, the tof at 20 keV is given with respect to the tof of the 187Re+ ions (18 μs), and the one at 1 keV with respect to the tof of the Re+ ions distribution (83 μs). The rhenium foil with natural abundance of 37.4% for 185Re and 62.6% for 187Re, as can be observed from the peak distribution at 20 keV, was prepared in the target lab of GSI-Darmstadt (Germany).
