Ca-I Under Consideration of Foreign Level Configuration Mixing Article Sidebar Full Text Published: Apr 5, 2021 Keywords: Foreign level configuration, perturbation correction, Rydberg energy levels, weakest bound electron Main Article Content S. RAZA M. A. ABRO I. Q. BALOCH R. SIDDIQUE Z. UDDIN Abstract Article Details Issue Vol 53 No 1 (2021): Sindh University Research Journal (Science Series) SURJ Section Articles