High-resolution measurement and quantum-defect analysis for the Ne nd' J= 1, 2 and 3 autoionizing resonances

Using resonant two-photon excitation of a metastable Ne(2p 5 3s 3P 0.2 ) beam by two single-mode CW dye lasers, we have measured reduced widths Gamma r =n* 3 Gamma n for the four Ne( 2 p 5 ( 2 P 1 2/) nd' (K) s ) autoionizing resonance series ((K) s =(3/2) 3 , (3/2) 2 , (5/2) 2 , and (5/2) 3 ). The resulting values are Gamma r =167(7), 350(7), 87(2), and 73(3) cm -1 , respectively, in good agreement with predictions by a semiempirical multichannel quantum-defect analysis involving complex quantum defects.