Photoelectron Angular Distributions for Photoionization of the Be-like B+ Ion

Photoelectron angular distribution asymmetry parameters β for the process leaving the ions in the B 2+ n p and n s ( n =2 and 3) states from the ground and excited 2 s 2 p 1,3 P states of Be-like B + ion have been calculated. The other final ionic states of B 2+ are states leading to a constant β=2. A noniterative variational R -matrix approximation has been used for the present calculation of transition strengths. With almost overlapped agreement between the length and velocity gauges, autoionizing doubly excited resonance structures converging to B 2+ 3 s , 3 p , and 3 d thresholds are clearly appeared in the present β parameters.