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Collaborative Computational Project Number 14

for Single Crystal and Powder Diffraction

CCP14

Methods, Problems and Solutions

The CCP14 Homepage is at http://www.ccp14.ac.uk
[General Information about the Collaborative Computational Projects (CCPs). CCP14 is part of the EPSRC Research Computing Initiative]
"The Collaborative Computational Projects (CCPs), assist universities in developing, maintaining and distributing computer programs and promoting the best computational methods."

2D to 3D Model Builders and Molecular Modelling Software, Starting Links
Software potentially useful for Fragment based structure solving software such as DIRDIF and PATSEE


Anharmonic Modelling Software
List of available Software for Modelling of Amorphous Materials

Anharmonic Thermal Refinement Software
List of available software that can perform Anharmonic Thermal Refinement Software

Automatic Divergence Slits (ADS) and Rietveld Analysis
Includes talk about the intensity correction algorithms presently used that are most likely just an approximation. Plus discussion on using Cubic In2O3 as a Reference Material for powder diffraction.

Possible binders for powder diffraction samples and affixing powders to zero background plates

Bond Valence Software
Available software and resources for performing Bond Valence Calculations

Bond Length and Bond Angle Calculation
Available Software for Bond Length and Bond Angle Calculation

Bond Length and Bond Angle Tables
Books, references and resources relating to Tables of Common Bond Length Values

BSD UNIX for Crystallography
Information primarily about using the BSD for PC based operating systems as secure crystallographic servers.

Calibration standards for Powder Diffraction
At present mainly discussing Silver Behenate as a low to medium angle calibration standard for powder diffraction

CCD Control and CCD Processing Software for Crystallography
List of available "indepedent" software to control CCD instruments and process/crunch the CCD data in various ways

Colour Blindness / Colour Deficient Vision / Colour Impaired Vision and Colours for Crystallographic Software
Available Resources relevant to Colour Safe Web Pages (and thus hopefully optional display modes in future Crystallographic software) for Colour Blindness / Colour Deficient Vision / Colour Impaired Vision.

Combined X-ray / Neutron Rietveld Refinement
Hints on Combined X-ray / Neutron Rietveld Refinement with the focus being on TOF Neutrons being used.

Crystallographic Client Computer and Operating System - Recommendations
Recommendations for powder diffraction and small molecule crystallography.

Data Conversion for Powder Diffraction
Available Software for Powder Diffraction Data Conversion / Interconversion

Dislocations: Can we calculate dislocation density from X ray diffraction?
Discussion on the above topic

Disorder, Single Crystal Structure Refinement and effects of Resolution
Discussion on the above topic

Environment Variables for Crystallographic Programs
Useful if on the move or installing programs around the place. Many programs like Platon and WinGX will only work at their optimal if all the environment variables are defined properly.

Face Indexing Absorption Correction and viewing of Crystals
Including face indexing algorithms/methods as a possible effective replacement for present non-rigourous empirical absorption, psi-scan based and DIFABS style approaches for absorption correction, and viewing the Crystal Shape.

Film for X-ray diffraction applications
Sources/brands of X-ray Film for Gandolfi, Precession and Weissenberg applications

Fortran Resources: Scientific Fortran Links and Creating GNU G77 Fortran Compiler compatible Dynamic Arrays
Resources and examples relating to creating Dynamic Arrays (Automatic Arrays/Dynamic Memory Allocation) that will compiled on G77. As well as looking into effects and problem solving when increasing static arrays. Links to other Fortran resources on the CCP14 site and beyond. Included are links to relevant scientific fortran resources including interfacing C and Fortran, free compilers and other specialist scientific programming resources.

Guinier Camera Digital Data
Discussion of Obtaining Digital Data From Guinier Camera Film

GSAS
Bob von Dreele and Allen Larson's GSAS and GSAS Hints/Resources

Hamilton R-factor Test
Discussion on the above topic

Hard Copy Graphs to Data
List of Programs for Converting Hard Copy Graphs and Plots back to Data (digitization / digitisation of paper copies)

Image Plate Software
Available Software for Integrating Intensities From Image Plates

Incommensurate Structure Software
Available Software for handling Incommensurate Structures

Indexing Software for Powders
Available Software for Powder Diffraction Indexing Including Publication Reference List
Also includes: Extracts from the 1957 M. Buerger Zeit. Krist. Paper on "Reduced Cells" (Including scanned images of Tables 2, 3 and 4 with comments/corrections by Ross Angel)
Also includes: Criteria for recognising the Best Cell from Powder Indexing and Hints on Recognising Pathologically Nasty Cells

International Tables Diagrams - Origin of the origin
Origin of the origin in the International Tables Diagrams

LeBail Method for Intensity Extraction
Links to History, Software and Implementation

Linux / UNIX for Crystallography
Information primarily about using Linux for PC based operating systems as secure crystallographic servers.

Low Temperature Standards for checking cryostats/low temperature chambers

LeBail Method for Intensity Extraction
Links to History, Software and Implementation

Mass absorption coefficients : Resources for estimating them.
Resources for estimating linear absorption coefficients/mass attenuation coefficients

Microabsorption/Phase Contrast Correction
Discussion of Microabsorption/Phase Contrast Correction for Powder Diffraction - including References

Molecular Model Building Kits and Links
Manual building of Crystallographic and molecular models

Multi Boot PC: Tricks on creating a Multi Boot PC with more than 4 operating Systems
Getting around the 4 Primary Partition Limit on a single disk using the freely available Ranish Partition Manager (PRM) and the GUI based Extended Operating System Loader (XOSL)

Neutron Scattering Lengths
Including information on Neutron Scattering Lengths vs. Lambda

OS Portable Graphical User Interfaces (GUIs) for Crystallographic Applications
Examples of creating OS Portable Graphical User Interfaces (GUIs) for Crystallographic Applications including wxWindows, Tcl/Tk and Java

Pawley Method
Background and list of software using Pawley Method for Intensity Extraction

PBC Software
List of PBC (periodic bond chains in crystal structures) Analysis Software

PDF, High Q Powder diffraction Analysis Software
Available Software for High Q Powder Diffraction Analysis for PDF/Local Order Determination

Peak Find/Profiling Software for Powder Diffraction
Available Software for Peak Find/Profiling Software for Powder Diffraction Data

Pole Figure Analysis Software
Available software for Pole Figure and Texture Analysis. Includes software that performs single peak and whole pattern methods; neutron and X-ray.

Polyhedral Volume Calculations
Available Software that Performs Polyhedral Volume Calculations

Powder Diffraction Data Visualisation
Available software for Powder Diffraction Data Visualisation. Includes software that will display multiple patterns, do back subtraction, alpha-2 stripping, smoothing, combine/merging/averaging of datasets and other functions.

Powder Diffraction File Summing, Normalization and Generation of ESDs
Advice on summing multiple powder diffraction files, normalizing the data to look like a fixed count time datafile, and generating the resulting ESDs on each data point.

Powder Diffraction: Mounting Samples in Powder X-ray Diffraction
Describes the nuances of various powder packing methods for X-ray diffraction

Structure Solution from Powder Diffraction
List of software for solving structures from powder diffraction dat (SDPD)

Literature References relating to Optimium Data Collection Strategies for Powder X-ray Diffraction

Powder Diffraction Structure Solution Pathways
A hopefully growing area showing possible pathways in solving strutures from powder diffraction data with an emphasis on trying to use real examples and real data.

Protein Crystallography Software/Macromolecular Crystallographic Software Starting links
For when small molecule software becomes too small.

Quantitative Clay Soil Analysis
Comments giving hints on Quantitative Clay Soil Analysis

Quantitative Analysis using the Rietveld method and Overall temperature factor refinement
Hints relating to Overall temperature factor refinement and Quantitative Rietveld Phase Analysis using Powder Diffraction

Reciprocal Space - Why?
Discussion on why Reciprocal Space is used in Crystallography

Resolution in powder diffraction
"delta d / d" vs "FWHM(Q) vs Q"

Rietveld Refinement Software
List of available Rietveld Refinement Software

Restrained Rietveld Refinement of Organics
Some suggestions and hints mainly based around using Crystals to perform DLS (Distance Least Squares) and to generate lists of retraints commands: following their input into GSAS or Fullprof

Rietveld and Rietveld ESD Literature
Literature References relating to ESDs, Probable Error and Rietveld Analysis

R and fit factors for Rietveld Analysis, Refining on R-Bragg, and Powder Calibration Standards for INEL PSD (Position Sensitive Detector)
Discussion and references from the Rietveld Mailing List. There is an additional page on Errors and Rietveld R Factors

Rietveld programs that have the ability to generate and view electron density Fourier Contour maps
This includes free standing programs that can generate and view Fourier Maps if given the correction input files.

Scattering Factors
Discussion on Scattering Factors and Scattering Factor resources

Search-Match Phase Identification Software
Available Software for Search-Match Phase Identification of Powder Diffraction Data

Single crystal HKL data conversion to Pseudo-powder diffraction data
List of available software for converting single crystal HKL files to Pseudo-powder patterns.(hkl2powder)

Single Crystal Structure Solution Software relevant to Chemical Crystallography

Single Crystal Structure Refinement Software relevant to Chemical Crystallography

Single Crystal Suites linking to multiple programs relevant to Chemical Crystallography

Spacegroup and Structure Transformation Software
Available Software for performing Spacegroup and Structure Transformation

Special Crystallographic Characters in Word
Hints on inserting Special Crystallographic Characters in MS-Word (e.g., p-1, p-4, etc)

Spray Drying and Preferred Orientation
Discussion on Spray Drying for minimizing Preferred Orientation in Packed Powders

Stereoscopes
Information for Obtaining 3D Stereo Viewing Glasses/Stereoscopes

Structure Conversion and Transformation
Available Software for Crystal Structure Conversion, Transformation and Interconversion

Structure Drawing and Visualisation
Available Software for Structure Drawing and Visualisation

Student Crystallography Links and Schools Crystallography Links
Links and resources concentrating primarily on crystallographic resources for pre-university students interested in crystallography.

TOF (Time of Flight) Neutron Diffraction Resources and Code
Programs, and hints of coding in TOF Neutron capability into programs

Twinning Resources for Single Crystal Diffraction
List of programs and resources on the internet to assist with helping sort out single crystal twinning problems.

Predicting in advance the Rietveld scale factor S for a TOF powder pattern
Discussion on Rietveld method Scale Factors on the Rietveld Mailing List

Unit Cell Refinement of Powder Diffraction Data
Available Software for Unit Cell Refinement of Powder Diffraction Data

Variable Count Time (VCT) Data Collection for Powder Diffraction
Discussions and resources based around Variable Count Time (VCT) Data Collection

WAP (Wireless Application Protocol) for Crystallography and Science
Using WAP for Crystallgraphic and Scientific applications. Example given is providing Synchrotron Beam Status to WAP enabled Mobile Phones

Windows NT 4 as part of a Multi Boot PC
Tips, tricks and pitfalls for installing WinNT 4 based around Ranish partition manager to create/edit partitions

Wine Windows Emulator for Linux to run Crystallographic Windows Programs
Tips, tricks and pitfalls for compiling and installing the Wine Windows emulator on Linux. Examples and tricks on installing a variety of crystallographic Windows programs to run under Linux.

Diffraction X-ray Tube Life and References
Discussion of X-ray Tube life, glass vs ceramic tubes and references for learning about X-ray tubes

Zero shift vs sample offset
Discussion of Zero shift vs sample offset


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