Analysis of the bound odd-parity spectrum of krypton by weakest bound electron potential model theory

Within the weakest bound electron potential model theory, the J = 0, 1,2, 3 , 4, 5 odd bound levels of neutral krypton are classified by spectrum-level -like series. In our previous work, we employed Martin's formula to calcula te the quantum defects for the unperturbed spectrum-level-like series and o btained excellent results. For the perturbed series, however, extra- or int erpolation using Martin's formula may lead to serious error. We, therefore, propose a quantum defect formula to fit the perturbed series by combining Martin's formula with Langer's. The regularity of spectrum-level-like serie s is investigated with the revised Martin formula. Great agreement with exp erimental values is obtained, and the deviations between the calculated val ues and experimental ones are less than 1 cm(-1). Meanwhile, some unknown l evel positions are predicted. (C) 2000 Elsevier Science B.V. All rights res erved.