O'Gorman, ColmColmO'GormanOtsuka, TakamitsuTakamitsuOtsukaYugami, NoboruNoboruYugamiJiang, WeihuaWeihuaJiangEndo, AkiraAkiraEndoLi, BowenBowenLiCummins, T. (Thomas)T. (Thomas)CumminsDunne, PadraigPadraigDunneSokell, EmmaEmmaSokellO'Sullivan, GerryGerryO'SullivanHigashiguchi, TakeshiTakeshiHigashiguchi2012-06-212012-06-212012 Ameri2012Applied Physics Letters0003-6951 (print)1077-3118 (online)http://hdl.handle.net/10197/3689We have demonstrated the effect of viewing angle on the extreme ultraviolet (EUV) emission spectra of gadolinium (Gd) near 6.7 nm. The spectra are shown to have a strong dependence on viewing angle when produced with a laser pulse duration of 10 ns, which may be attributed to absorption by low ion stages of Gd and an angular variation in the ion distribution. Absorption effects are less pronounced at a 150-ps pulse duration due to reduced opacity resulting from plasma expansion. Thus for evaluating source intensity it is necessary to allow for variation with both viewing angle and target orientation.343919 bytesapplication/pdfenThe following article appeared in Applied Physics Letters, 100, 141108 (2012) and may be found at http://dx.doi.org/10.1063/1.3701593. The article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.Plasma sourcesGadoliniumPlasma production by laserPlasma transport processesGadoliniumLaser plasmasTransport theoryJournal Article10014141108-1141108-410.1063/1.3701593https://creativecommons.org/licenses/by-nc-sa/1.0/