Variational calculation for the doubly excited state (2p2)3Pe of BeIII

Abstract

Nonrelativistic energy of the (2p(2))(3)P(e) state of Be(2+) has been calculated using Ritz-variational method. The trial wave function is of Hylleraas type. The upper-bound energy E=-3.382 712 420 77 a.u. calculated by us is the lowest yet obtained.

Energies and transition wavelengths for Li II, Be III, B IV, C V embedded in Debye plasmas

“…Due to the abundance of doubly excited states in astrophysical plasmas 30 and due to the advancement in the production of helium-like ions in laser plasmas in the laboratory, 31 it is of great interest to study nonautoionizing doubly excited states energies and wavelengths for helium-like ions embedded in Debye plasma. In free atomic cases, several theoretical [32][33][34][35][36][37][38][39][40] and experimental studies [41][42][43][44][45] have been performed on the doubly excited nonautoionizing states of helium and helium-like ions. Very recently, we have reported results for doubly excited states of helium and helium-like ions.…”

Doubly excited non-autoionizing1,3Peand1,3Dostates of two-electron highly stripped atoms

“…Over the last few decades, several experimental investigations ( [14][15][16][17] and references therein) and theoretical studies [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35] have been performed on the doubly excited non-autoionizing states of helium and helium-like ions. Recently, Mukherjee and Mukherjee [28] reported the 1,3 P e states of He I, Li II [29], Be III [30] and O VII [10] and the 1,3 D o states of two-electron atoms (Z = 3-7) [6]. Eiglsperger et al [8] investigated high-lying doubly excited non-autoionizing states of higher angular momentum in helium within the framework of the configuration interaction approach.…”