On the Ne(2p5ns',nd') autoionisation resonances: high-resolution measurement and quantum defect analysis

Using mass spectrometric ion detection, the authors have studied the low-lying Ne(2p 5 14s', 12d') autoionisation resonances by transverse two-photon laser excitation of a metastable Ne(2p 5 3s 3 P 2 ) atom beam via the Ne(2p 5 3p 1 D 2 ) intermediate state. The resonance width of a fitted Beutler-Fano profile was determined as Gamma (14s', J=1)=(6.0+or-0.5)GHz, Gamma (12d', J=1-3)=(2.0+or-0.5)GHz in very good agreement with values deduced in a multichannel quantum defect analysis of available spectroscopic data.