Studies of narrow autoionizing resonances in gadolinium

摘要: The autoionization (AI) spectrum of gadolinium between the first and second limits has been investigated by triple-resonance excitation with high-resolution cw lasers. A large number narrow AI resonances have observed assigned total angular momentum J values. are further divided into members Rydberg series converging to limit or other ''interloping'' levels. Fine structure in identified interpreted terms Jc j coupling. detailed studies performed on interloping resonances: These include lifetime determination lineshape analysis, isotope shifts, hyperfine structure, photoionization saturation parameters. electronic levels is discussed these studies. Linewidths generally decrease increasing = 7 extremely Lorentzian widths ranging from < 1 MHz up 157 MHz. strongest found cross-sections {approx}10-12 cm{sup 2} can be saturated powers available diode