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( 1 D)6p 2 D 3/2 o (29607.98 cm -1 ) and 6s 2 ( 1 S)7p 2 P 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.
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