Fig. 2

Comparisons of our MBPT and some experimental energy levels (square, see references below) for 1s2p1P1, 1s2p3P1, 1s2p3P2, 1s2s3S1, as well as the comparisons with theoretical values from Drake (1988; solid line) and Artemyev et al. (2005; dashed line). The experimental energy levels for 1s2p1P1 are taken from Epp et al. (2015) and those reviewed by Beiersdorfer & Brown (2015). The experimental energy levels for 1s2p3P1 are adopted from Schleinkofer et al. (1982), Briand et al. (1983), Deslattes et al. (1984), Indelicato et al. (1986), MacLaren et al. (1992), Widmann et al. (1996), Chantler et al. (2000), Rudolph et al. (2013), Schlesser et al. (2013), Payne et al. (2014), and Beiersdorfer & Brown (2015). Those for 1s2p3P2 are taken from Briand et al. (1983), Deslattes et al. (1984), MacLaren et al. (1992), Widmann et al. (1996), Chantler et al. (2000), Schlesser et al. (2013), Payne et al. (2014), and Beiersdorfer & Brown (2015). Those for 1s2s3S1 are from MacLaren et al. (1992), Widmann et al. (1996), Chantler et al. (2000), Amaro et al. (2012), Payne et al. (2014), and Beiersdorfer & Brown (2015).
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