The paper reviews both the properties and the applications of core-excited metastable atoms. The production of these atoms by microwaves, pulsed hollow-cathode discharges, and laser-produced x rays is described. We discuss the application of these atoms to several new types of spectroscopy that allow autoionizing linewidths as narrow as 0.1 cm-1 to be measured. The application of these metastables to the generation of picosecond-time-scale soft-x-ray pulses and to XUV lasers is also discussed.
© 1987 Optical Society of America
S. E. Harris and J. F. Young, "Core-excited metastable levels: application to spectroscopy, to the generation of picosecond extreme-ultraviolet pulses, and to lasers," J. Opt. Soc. Am. B 4, 547-562 (1987)