journal letter

At about this time, the first three-line folded spectrum of 57Fe appeared [29] (see Fig. 5.8, top), which unfolded becomes the standard six-line spectrum so familiar today. This spectrum was produced by a magnetically split (six-line) iron source and a nonmagnetic (single line) ferrocyanide absorber. Essentially simultaneously with this report came the landmark paper of Kistner and Sunyar. — Hanna in the Mössbauer Story