Ab initio calculation of the lifetimes of 4p and 3d levels of Ca+

We have done an [ital ab] [ital initio] calculation based on the Brueckner approximation for the lifetimes of 4[ital p][sup 2][ital P] and 3[ital d][sup 2][ital D] levels of Ca[sup +]. The results of the Brueckner approximation differ from experiment by 2.5%. With leading third-order corrections included, our results agree with the latest accurate experiment within a 1% difference.