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Multi-step laser resonance ionization spectroscopy of lutetium (Lu) has beenperformed at TRIUMF's off-line laser ion source test stand. The even-parityRydberg series $6s^2nd$ $^2D_{3/2}$, $6s^2nd$ $^2D_{5/2}$ and $6s^2ns$$^2S_{1/2}$ were observed converging to the 6s$^2$ ionization potential. Theexperimental results has been compared to previous work. 51 levels of Rydbergseries $6s^2nd$ $^2D_{5/2}$ and 52 levels of Rydberg series $6s^2ns$$^2S_{1/2}$ were reported new. Additionally six even-parity autoionization (AI)series converging to Lu ionic states $5d6s$ $^3D_1$ and $5d6s$ $^3D_2$ wereobserved. The level energies of these AI states were measured. Theconfigurations of the AI states were assigned by relativistic multichanneltheory (RMCT) within the framework of multichannel quantum defect theory(MQDT).

Study of even-parity Rydberg and autoionizing states of lutetium by laser resonance ionization spectroscopy