Study of Even-Parity Autoionization States of Lutetium Atom by Atomic Beam Laser Resonance Ionization Spectroscopy

Abstract

Autoionization states of neutral lutetium atom (Lu I) were investigated using atomic beam and two-color two-step laser resonance ionization spectroscopy (RIS). The Lu I was excited to the 5d6s(¹D)6p ²D_3/2^o (29607.98, cm^-1) and 6s²(¹S)7p ²P_1/2^o (29430.90, cm^-1) states by the first step excitation and their channels were studied for the autoionization states. Twelve dyes were used at the second step excitation. Eighty-six autoionization states were found through the former channel and 49 states through the latter channel. There were 102 even-parity autoionization states after the elimination of the overlap of the states and 98 were new ones. Their total angular momentum (J) values were estimated.