Figure 1
From: Production study of Fr, Ra and Ac radioactive ion beams at ISOLDE, CERN
Ion current measurements of the ion beam intensity with mass-to-charge ratio m/q = 227. (a) Influence of the ion source temperature on extracted laser- and surface ionized ion beams. The data marked as “Laser On” correspond to a laser enhancement of \(^{227}\)Ac. Hence the data marked as “Laser Off” represents surface-ionized species, which are mostly \(^{227}\)Fr and \(^{227}\)Ra. (b) Ratio of total ion beam intensity when “Laser On” relative to the total ion beam intensity when “Laser Off” on mass m/q = 227. Negative currents are caused by the subtraction of the Faraday cup offset. Within the error bar, the ion current nevertheless remains positive.
