@article{oai:repo.qst.go.jp:00079375,
 author = {Shimada, Yuta and Kawasaki, Hiromu and Watanabe, Kanon and Hara, Hiroyuki and Anraku, Kyoya and Shoji, Misaki and Oba, Toru and Matsuda, Masaru and Jiang, Weihua and Sunahara, Atsushi and Nishikino, Masaharu and Namba, Shinichi and Gerry, O’Sullivan and Higashiguchi, Takeshi and Masaharu, Nishikino},
 issue = {11},
 journal = {AIP Advances},
 month = {Nov},
 note = {The extension of the roadmap of shorter wavelength extreme ultravi-
olet (EUV) and soft x-ray sources is a topic of considerable interest.
We have studied the optimized emission from high power and/or high
brightness sources based on unresolved transition array (UTA) emis-
sion. The peak UTA wavelengths follow a quasi-Moseley’s law  for the laser wavelength of 1064 nm and λ = 165.8 × R^−1(Z − 12.44)−1.94 ∞
nm for the laser wavelength of 532 nm, respectively. The photon flux decreased with increasing atomic number. We also mapped the optimum electron temperatures and corre- sponding charge states required to produce strong soft x-ray UTA emis- sion with a photon flux of the order of 10^14 photons/nm · sr. The present quasi-Moseley’s law is sufficient for identifying the optimum element for numerous applications, such as material ablation and ionization, nano- lithography, and in vivo biological imaging.},
 title = {Optimized highly charged ion production for strong soft x-ray sources obeying a quasi-Moseley’s law},
 volume = {9},
 year = {2019}
}