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Anomalous scattering factor determined by semicircle fitting near the K-absorption edge of Ge.
Yoshizawa, Masami; Zhou, Shengming; Negishi, Riichirou; Fukamachi, Tomoe; Kawamura, Takaaki.
Afiliação
  • Yoshizawa M; Saitama Institute of Technology, Fusaiji, Okabe, Saitama 369-0293, Japan. yoshizaw@sit.ac.jp
Acta Crystallogr A ; 61(Pt 6): 553-6, 2005 Nov.
Article em En | MEDLINE | ID: mdl-16244404
It is shown that the locus of the f' + if'' plot in the complex plane, f' being determined from measured f'' by using the dispersion relation, looks like a semicircle very near the absorption edge of Ge. The semicircular locus is derived from a quantum theory of X-ray resonant scattering when there is a sharp isolated peak in f'' just above the K-absorption edge. Using the semicircular behavior, an approach is proposed to determine the anomalous scattering factors in a crystal by fitting known calculated values based on an isolated-atom model to a semicircular focus. The determined anomalous scattering factors f' show excellent agreement with the measured values just below the absorption edge. In addition, the phase determination of a crystal structure factor has been considered by using the semicircular behavior.
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Coleções: 01-internacional Base de dados: MEDLINE Tipo de estudo: Prognostic_studies Idioma: En Revista: Acta Crystallogr A Ano de publicação: 2005 Tipo de documento: Article País de afiliação: Japão
Buscar no Google
Coleções: 01-internacional Base de dados: MEDLINE Tipo de estudo: Prognostic_studies Idioma: En Revista: Acta Crystallogr A Ano de publicação: 2005 Tipo de documento: Article País de afiliação: Japão