Mössbauer Effect in Ferrocyanide
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In order to utilize the Mössbauer effect more conveniently, it would be desirable to have either a source or an absorber which is monoenergetic. To date, the detailed work using Fe57 has employed soft iron sources and absorber; here, the inner magnetic field creates a hyperfine splitting which is disadvantageous for some work.
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