A similarity index for comparing diffraction patterns

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Presentation transcript:

A similarity index for comparing diffraction patterns PDF-4 Integral Index A similarity index for comparing diffraction patterns

This presentation is best viewed Note This presentation is best viewed in Slide Show Mode.

What is the Integral Index? The Integral Index creates numerical values based on the user’s full experimental data compared to patterns in the PDF-4+ database. These index values can then be used as an additional tool for data mining and trend analysis. The Integral Index formula is a sum of the differences between the full experimental pattern and a simulated full pattern. The simulated full pattern is calculated from the database using instrumental and experimental factors. This formula is based on the Hofmann and Kuleshova similarity index. The Integral Index value ranges from 0-100%. The lower the index value, the better the match, giving 0% a perfect match and 100% a complete non-match.

The Integral Index Process Search Settings Import Process Data Results Adjust Settings Graph Results Print Results

Search The first step in utilizing the Integral Index method is to create search criteria based on non-whole pattern data. This effectively narrows down the entire database into a more meaningful form. Search Criteria: Only Cobalt, Hydrogen, Nitrogen, Oxygen, & Carbon Ambient Quality Mark Star Or Indexed Or Blank

Search Results After a search is performed, the results window will automatically appear.

Set Preferences Before you import full experimental data, you must change the diffraction graph settings to match. Select preferences in the main menu or click the double-check icon on the main toolbar.

Diffraction Graph Preferences There are 2 sets of preferences for diffraction graphs: experimental and calculated. Calculated patterns have either structure factors or atomic coordinates in the database. The diffraction graph will specify calculated or experimental on the form. PDF-4+ 2008 Calculated Experimental ICDD 742 101,810 ICSD-FIZ 70,447 317 NIST 4,952 171 LPF 106,963 0

Experimental Diffraction Preferences Select the Diffraction tab, then the Experimental tab. Adjust the settings to match the experiment.

Calculated Diffraction Preferences Select the Diffraction tab, then the Calculated tab. Adjust the settings to match the experiment.

Range The range and step size are automatically set for the Integral Index from the whole pattern experimental data and cannot be changed by the Diffraction Preferences.

Import Data On the results form, select “Show Integral Index” under indexing, or Change Experimental Data, if it is enabled.

Selecting a File You can import a number of different file formats supporting various diffractometers and software.

Processing the Imported Data Since database patterns have been processed to eliminate background and noise, the same needs to be done to the experimental data. Two functions are provided to accomplish this: Smooth Remove background

Smooth noisy patterns for consistent results. Smoothing Smooth noisy patterns for consistent results.

Removing the Background Remove background noise and air scatter for more accurate peaks.

Identify Peaks Use Preview to view peaks and the graph’s Zoom feature to correctly identify peaks.

Calculate Indexes Select OK to complete the processing of the full pattern and calculate Integral Indexes.

Integral Index Display The Integral Index is added to the right side of the results form. Lowest value is the best match. After it is completed, the status in the lower left corner will disappear. Clicking on the column title will sort it.

Using the Data Get the most out of the data by using other tools and features: Histogram – Plot the Integral Index against any database field or the number of results. Print a report – Create a customized report on your results using any database fields on any size paper. Plot a graph – Overlay a simulated full pattern of any database entry with your experimental data.

Histogram Compare sets of data to determine patterns and attributes of your results. Right-click on any field and select graph fields…

Report Print a report using the menu on the results form or click on the printer icon.

Graph Using the results form menu, or by right clicking on an entry, you can display a graph overlaying the selected pattern over the experimental pattern. Determine the experiment’s range and set the range accordingly to correctly display diffraction graphs.

International Centre for Diffraction Data Thank you for viewing our tutorial. Additional tutorials are available at the ICDD web site (www.icdd.com). International Centre for Diffraction Data 12 Campus Boulevard Newtown Square, PA 19073 Phone: 610.325.9814 Fax: 610.325.9823