TABLE II: Comparison of transition wavelengths for Li $^{−}$, Be − with literature data. 1 a.u.=27.2113834 eV. ¯ h c=197.3269602 eV nm. X-only values are enclosed in parentheses. $^{a}$Ref. [7]. $^{b}$Ref. [6]. $^{c}$Ref. [33]. $^{d}$Ref. [4]. $^{e}$Ref. [9]. $^{f}$Ref. [10]. $^{g}$Ref. [15]. $^{h}$Ref. [34]. $^{i}$Ref. [20]. $^{j}$Ref. [5]. $^{k}$Ref. [19]. $^{l}$Ref. [12]. $^{m}$Ref. [13]. $^{n}$Ref. [35]. Wavelength (nm) Transition This work Other theory Experiment Li − 1s2s2p $^{2 5}$P e → 1s2p $^{3 5}$S o 345.96 346.06 $^{a}$,349.12$^{b}$,349.0$^{c}$,348.98d 349.07 $^{e}$,349.0f (321.55) Be − [He] 2s2p $^{2 4}$P e → [He] 2p $^{3 4}$S o 264.14 267.1 $^{g}$,265.4$^{h}$,265.370$^{i}$,265.32$^{j}$, 265.04k 265.301 $^{l}$,265.318$^{m}$,265.331n (252.29) FIG. 1: Radial density plots for several states of (a) Li − and (b) Be $^{−}$. large distances, all these three states show similar behavior with the ground state having greater charge density and decaying rather slowly than the two excited states; $^{5}$P e dying out fastest. Similar radial density plots for all three excited states of Be − are given in Fig. 1(b). In the vicinity of nucleus, the $^{4}$P $^{e}$, $^{4}$S o states show similar behavior and have much larger charge densities compared to the $^{6}$S o state, again presumably because the former two have two core 1s electrons while the latter has only one. At the intermediate distance after the first minimum and up to r =3 . 5 a.u., this situation changes with $^{6}$S o having the largest charge density. Also the $^{4}$S $^{o}$, $^{4}$P e states branch out in this region with the latter showing slightly larger peak value than the former. After that at larger distances, all the three states decay in a similar pattern with $^{4}$S o having higher values and oozing out slowly than the other two and $^{6}$S o decaying out first. These behaviors in electron density are also reflected 8  0  1  2  3  0  2  4  6  8  10 Radial density (a.u.)  r (a.u.) (a) 1s$^{2}$2s$^{2 1}$S e 1s2s2p$^{2 5}$P e 1s2p$^{3 5}$S o  0  1  2  3  4  0  2  4  6  8 Radial density (a.u.)  r (a.u.) (b) 1s$^{2}$2p$^{3 4}$S o 1s$^{2}$2s2p$^{2 4}$P e 1s2s2p$^{3 6}$S o