Zhang Dian-Cheng, Zhang Ying, Li Xiao-Kang, Jia Feng-Dong, R. Li, Zhong Zhi-Ping. Electron correlation effects in even Rydberg series converging to 4f13(2F7/2o)6s(7/2, 1/2)4o and 4f13(2F7/2o)6s(7/2, 1/2)3o of thulium atomJ. Acta Physica Sinica, 2018, 67(18): 183102. DOI: 10.7498/aps.67.20180797