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Reliability of second-harmonic generation in crystalline powders at optical frequencies as a test of absence of centrosymmetry (1976)

Coda, A. ; Pandarese, F.

Copenhagen : International Union of Crystallography (IUCr)

Applied crystallography online 9 (1976), S. 193-198

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ISSN: 1600-5767

Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001

Topics: Geosciences , Physics

Notes: The detection of centre of symmetry is a problem of great importance in the determination of crystal structures by X-ray methods, and not always solvable by these methods alone. Generation of a second harmonic at optical frequency is governed by coefficients which are zero for all centrosymmetric point groups and 432, 422, 622 groups and non-zero for all other non-centrosymmetric point groups. Results are reported of second-harmonic tests on 90 crystalline powders. The wide range of applicability makes the second-harmonic generation test rather attractive and more advantageous than other physical methods.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1107/S0021889876010947

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