Analysis of 1s(2s2p 3P)nl Rydberg states in the K-shell photoionization of the Be atom

We have observed inner-shell photoionization of Be using synchrotron radiation in the energy region of the 1s(2s2p P-3)nl Rydberg states. We used a time-of-flight method to distinguish singly and doubly charged photoions and obtained the Be+ [ns; n=5-12, (P-1)3s] and Be2+ [ns; n=5-8, nd=5,6, (P-1)3s] ion spectra with high resolution corresponding to an instrumental bandpass of 13 meV. Detailed analysis enabled the autoionization parameters, resonance energy position E-0, resonance width Gamma, and Fano parameter q, to be obtained. From the resonance positions of the (3)Pnl series members, the series limit was determined to be 127.97 eV, which is in good agreement with previous experiments.