Notes. The present values from the RCI calculations are given in Col. 3. In the next two columns, theoretical values from former MCHF-BP and close coupling (CC) calculations are displayed. The CC values complement the MCHF-BP values, which are restricted to transitions between levels in the lower part of the Al I spectrum. All theoretical transition rates are presented in length form. The last two columns contain the results from experimental observations. The experimental results go along with a letter grade, whenever accessible, which indicates the accuracy level. The correspondence between the accuracy ratings and the estimated relative uncertainty of the experimental results is A ≤ 3%, B ≤ 10%, C + ≤15%, C ≤ 25%, D + ≤30%, D ≤ 50%.

References.