THE RELATIONSHIP BETWEEN THE ANOMALOUS TRANSMISSION AND THE NEGATIVE EXTINCTION IN THE BRAGG CASE

XU ZHANGCHENG^a,b, GUO CHANGLIN^b and ZHAO ZONGYAN^c

^a CCAST (World Laboratory), P.O.Box. 8730, Beijing 100080, People's Republic of China
^b Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, People's Republic of China (mailing address)
^c Department of Physics, Anhui University, Heifei 230039, People's Republic of China

Received 9 June 1997

The relationship between the anomalous transmission and the negative extintion in the symmetrical Bragg case near the absorption edge is studied in detail. The negative extinction results from the anomalous transmission and takes the largest value when the diffraction is induced only by the imaginary part of the atomic scattering factor near the absorption edge. The appearance of the negative extinction also depends on temperature, which can be used for the identification of the theoretical model for calculating the Debye-Waller factor.

UDC 538.951
PACS 61.10.Dp

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