Eur. Phys. J. A 13, 243-246 (2002)

In-beam Mössbauer study of using a secondary beam and ion implantation

Y. Kobayashi¹, Y. Yoshida², M.K. Kubo³, Y. Yamada⁴, A. Yoshida¹, H. Ogawa¹, H. Ueno¹ and K. Asahi<sup>1

1</sup>  RIKEN, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
²  Shizuoka Institute of Science and Technology, Fukuroi, Shizuoka 437-8555, Japan
³  Department of Chemistry, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
⁴  Department of Chemistry, Science University of Tokyo, Shinjuku, Tokyo 162-8601, Japan

(Received: 1 May 2001 / Revised version: 31 August 2001 )

Abstract
We have succeeded in obtaining well-resolved Mössbauer spectra of ⁵⁷Fe arising from short-lived ⁵⁷Mn ( T_1/2 = 1.45 min) in Si and KMnO ₄. The Mössbauer spectra of ⁵⁷Fe in Si are well fitted with a curve consisting of two singlet lines, one being assigned as the interstitial Fe atoms and the other as substitutional ones. The relative intensities of the two lines infer that 60% of ⁵⁷Fe ( ⁵⁷Mn) atoms land at the interstitial sites and 40% at the substitutional sites at temperatures between 30 K and 296 K. The result for the KMnO ₄ sample suggests a presence of an exotic chemical species corresponding to a higher valence state than Fe ⁶⁺.

PACS
87.64.Pj - Mössbauer spectroscopy.
23.90.+w - Other topics in radioactive decay and in-beam spectroscopy (restricted to new topics in section 23).
61.72.Ww - Doping and impurity implantation in other materials.
31.30.Gs - Hyperfine interactions and isotope effects, Jahn-Teller effect.

© Società Italiana di Fisica, Springer-Verlag 2002