By Frederick Seitz, David Turnbull and Henry Ehrenreich (Eds.)

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Renninger, A d a Cryst. 6, 711 (1952). 1,respectively. Within the region of the measurements, this term would in no way influence the calculated values. 02)2], which has, at the center of the neighboring C1 ion, still 25% of its value at r = 0. Consequently, the missing half of an electron is due t o the lack of information at low values of s. This is obvious from the ambiguity of interpolation between 111 and 311 in Fig. , the dotted one would be permissible, too. In addition, the accuracy of measurements at reflections with uneven indices is less because of their low intensities.

Brill and K. L. Krist. 117, 321 (1962). ELECTRON DISTRIBUTION I N CRYSTALS 17 required if p cannot be expressed in form of a treatable function. Furthermore, the array over which the integration should be performed is not defined unambiguously. : [: AX, y, 2 ) d x dy dz. Inserting for p its value according to Eq. r[h(r + râ€™) + k ( s + sâ€™) + Z(t + t â€˜ ) ] ) . 1) This equation is simplified appreciably if the atom to be considered is located at the zero point of the coordinate system and the integration is performed from -r to +r, etc.

12. Atomic arrangement in cyanuric acid (HNC0)a (Verschoor6l). 30 R. BRILL [toil T FIQ. 13. 1 electron-A-3; broken lines: negative electron densities; chain dotted lines: 0 electron-A-3. 4sThe paper of Dawson shows that very carefully performed experiments, indeed, allow a very accurate determination of the electron distribution, at least in solids of simple structure. To obtain similar accuracy in other substances, measurements at low temperatures and also exact determinations of the location of the atoms by means of neutron diffraction might be required.