Double L-shell ionization K alpha satellites in electron excited X-ray emission spectrum of metallic cobalt

The K alpha(5-8) satellite spectrum of metallic cobalt, excited by a 25 keV electron beam was recorded photographically on a 40 cm bent crystal spectrograph of the Cauchois-type. Three new satellites were observed at 1.7747, 1.7691, and 1.7634 Angstrom (1 Angstrom = 10(-10) m). These are identified as alpha(5), alpha(6), and alpha(7), respectively, and assigned mainly to the D-2(5/2) - D-2(5/2) - P-2(3/2) - D-2(5/2), and P-2(1/2) - D-2(3/2) transitions, respectively, of 1s(-1) 2p(-2) - 2p(-3) array.