Diffuse scattering - Revision history

KevinYager: /* See Also */

2017-12-01T15:36:29Z

‎See Also

2015-10-27T14:38:04Z

‎Structured Diffuse Scattering

2015-08-18T16:09:23Z

‎Structured Diffuse Scattering

2015-06-11T19:45:16Z

‎Structured Diffuse Scattering

2015-02-13T21:08:52Z

‎Analysis: low-q

2015-02-13T21:08:04Z

‎Analysis: low-q

2015-02-13T20:20:03Z

‎Analysis: low-q

2015-02-13T20:19:10Z

‎Guinier model

2015-01-29T21:37:21Z

2015-01-29T21:37:11Z

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 * Oleg Shpyrko [http://www.aps.anl.gov/Users/Scientific_Interest_Groups/LSM/schedule/Shpyrko_Oct05.pdf Overview of X-ray Reflectivity and Diffuse Scattering from Liquid Surfaces]
 * C. Fradin, A. Braslau, D. Luzet, D. Smilgies, M. Alba, N. Boudet, K. Mecke & J. Daillant [http://www.nature.com/nature/journal/v403/n6772/abs/403871a0.html Reduction in the surface energy of liquid interfaces at short length scales] ''Nature'' '''2000''', 403, 871-874. [http://dx.doi.org/10.1038/35002533 doi: 10.1038/35002533]
 ==See Also==

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 *  T. R. Welberry and D. J. Goossens  [http://journals.iucr.org/m/issues/2014/06/00/zx5002/index.html Diffuse scattering and partial disorder in complex structures] ''IUCrJ'' '''2014''' 1 (6), 550-562 [http://dx.doi.org/10.1107/S205225251402065X doi: 10.1107/S205225251402065X]
 * E. J. Chan [http://scripts.iucr.org/cgi-bin/paper?po5039 On the use of molecular dynamics simulation to calculate X-ray thermal diffuse scattering from molecular crystals] ''J. Appl. Cryst.'' '''2015''', 48. [http://dx.doi.org/10.1107/S1600576715013242 doi: 10.1107/S1600576715013242]
 More broadly, highly anisotropic and structured diffuse scattering indicates that the material exhibits some non-trivial combination of order and disorder in realspace. For instance, the disorder/defects may be ordered in some way (correlated disorder). Whereas diffuse scattering is traditionally seen as encoding structuring on a very local scale, structured diffuse scattering relates to order on intermediate size-scales.

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 * E. J. Chan, T. R. Welberry, D. J. Goossens, A. P. Heerdegen, A. G. Beasley and P. J. Chupas [http://journals.iucr.org/b/issues/2009/03/00/issconts.html Single-crystal diffuse scattering studies on polymorphs of molecular crystals. I. The room-temperature polymorphs of the drug benzocaine] ''Acta Crystallographica Section B Structural Science'' '''2009'', B65 (3), 382-392 [http://dx.doi.org/10.1107/S0108768109015857 doi: 10.1107/S0108768109015857]
 *  T. R. Welberry and D. J. Goossens  [http://journals.iucr.org/m/issues/2014/06/00/zx5002/index.html Diffuse scattering and partial disorder in complex structures] ''IUCrJ'' '''2014''' 1 (6), 550-562 [http://dx.doi.org/10.1107/S205225251402065X doi: 10.1107/S205225251402065X]
 More broadly, highly anisotropic and structured diffuse scattering indicates that the material exhibits some non-trivial combination of order and disorder in realspace. For instance, the disorder/defects may be ordered in some way (correlated disorder). Whereas diffuse scattering is traditionally seen as encoding structuring on a very local scale, structured diffuse scattering relates to order on intermediate size-scales.

@@ Line 79: / Line 79: @@
 *  T. R. Welberry and D. J. Goossens  [http://journals.iucr.org/m/issues/2014/06/00/zx5002/index.html Diffuse scattering and partial disorder in complex structures] ''IUCrJ'' '''2014''' 1 (6), 550-562 [http://dx.doi.org/10.1107/S205225251402065X doi: 10.1107/S205225251402065X]
-More broadly, highly anisotropic and structured diffuse scattering indicates that the material exhibits some non-trivial combination of order and disorder in realspace. For instance, the disorder/defects may be ordered in some way. Whereas diffuse scattering is traditionally seen as encoding structuring on a very local scale, structured diffuse scattering relates to order on intermediate size-scales.
+More broadly, highly anisotropic and structured diffuse scattering indicates that the material exhibits some non-trivial combination of order and disorder in realspace. For instance, the disorder/defects may be ordered in some way (correlated disorder). Whereas diffuse scattering is traditionally seen as encoding structuring on a very local scale, structured diffuse scattering relates to order on intermediate size-scales.
 * Ray Withers [http://journals.iucr.org/m/issues/2015/01/00/gq5002/index.html A modulation wave approach to the order hidden in disorder] ''IUCrJ'' '''2015''', 2 (1), 74-84 [http://dx.doi.org/10.1107/S2052252514022556 doi: 10.1107/S2052252514022556]
 ==Liquid Surface Diffuse Scattering==

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 ==Analysis: low-''q''==
 Diffuse scattering can be difficult to quantify, since so many different effects contribute to it. Nevertheless, if one has a good understanding of the expected kind of disorder, one can fit the diffuse scattering with a model.
 ===Ornstein-Zernike model===
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 * References:
 ** B. Hammouda [http://journals.iucr.org/j/issues/2010/04/00/ce5078/ A new Guinier-Porod model] ''J. Appl. Cryst. '''2010''', 43, 716-719. [http://dx.doi.org/10.1107/S0021889810015773 doi: 10.1107/S0021889810015773]
 ==Analysis: high-''q''==

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 I(q) \propto e^{ - R_g^2 q^2 / 3 }
 </math>
 ==Analysis: high-''q''==

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 Yields average radius of gyration (''R<sub>g</sub>''):
 ::<math>
-I(q) \propto e^{ R_g^2 q^2 / 3 }
+I(q) \propto e^{ - R_g^2 q^2 / 3 }
 </math>

← Older revision		Revision as of 21:37, 29 January 2015
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−	[[Image:Diffuse scattering example SAXS.png\|300px\|thumb\|~~center~~\|Example [[SAXS]] of a disordered composite, which generates [[diffuse scattering]] at low ''[[q]]''.]]	+	[[Image:Diffuse scattering example SAXS.png\|300px\|thumb\|right\|Example [[SAXS]] of a disordered composite, which generates [[diffuse scattering]] at low ''[[q]]''.]]

	'''Diffuse scattering''' is the [[scattering]] that arises from any departure of the material structure from that of a perfectly regular [[lattice]]. One can think of it as the signal that arises from disordered structures, and it appears in experimental data as scattering spread over a wide ''q''-range (diffuse). Diffuse scattering is generally difficult to quantify, because of the wide variety of effects that contribute to it.		'''Diffuse scattering''' is the [[scattering]] that arises from any departure of the material structure from that of a perfectly regular [[lattice]]. One can think of it as the signal that arises from disordered structures, and it appears in experimental data as scattering spread over a wide ''q''-range (diffuse). Diffuse scattering is generally difficult to quantify, because of the wide variety of effects that contribute to it.