Spectroscopic Properties of Sr 5p_1/2ns Autoionizing States

The resonance profile of the Sr 5p_1/2ns states and angular dependence of ejected electrons have been studied by using three-step excitation scheme. Energy levels and widths of the 5p_1/2ns states with n ranging from 7 to 10 are measured. The electrons originated from the decays to different ionic states are resolved with the time-of-flight detector.