Nonlinear level crossing spectroscopy of highly excited levels in yttrium using stepwise laser excitation

Abstract

A technique based on the detection of nonlinear level-crossing resonances in finite magnetic fields has been extended to the study of high-lying electronic levels excited by stepwise excitation with two cw dye lasers. The method has been applied to the determination of |A/gJ| values for four highly excited even-parity levels and two odd-parity levels in yttrium I. Using recently determined values of the magnetic hyperfine interaction constant A, LandégJ-factors have been deduced for these levels with an accuracy of about 1%. The results show significant differences from previous determinations. Show more