popLA Manual (PDF) - Materials Science and Engineering
popLA Manual (PDF) - Materials Science and Engineering
popLA Manual (PDF) - Materials Science and Engineering
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HARMONIC ANALYSIS (page 4)<br />
HARMONIC ANALYSIS (<strong>popLA</strong> page 4)<br />
0. Quit<br />
1. Return to Page 1<br />
Find harmonic coefficients .HCF, completed PFs (.FUL) for:<br />
2. Cubic crystal system<br />
3. Hexagonal, tetragonal or orthorhombic crystal system<br />
4. Compute SOD or COD from harmonic coefficients (slow!)<br />
5. Recalculate pole figures .HPF<br />
6. Inverse pole figures .HIP<br />
7. List harmonic coefficients to screen or printer<br />
8. Establish coefficients for a given transformation<br />
9. Apply TRANSFORMATION to given coefficients<br />
Note: To convert Aachen-format Bunge coeffs. to Kallend’s binary<br />
Roe coeff.file .HCF: use AC2Wlmn (outside this menu) -<br />
Also need FAKTOR.CtW (J. Hirsch)<br />
Please enter a number from 0 to 7 --><br />
#0 Quit<br />
Selecting this option quits <strong>popLA</strong> <strong>and</strong> returns control to DOS comm<strong>and</strong> shell<br />
#1 Return to Page 1<br />
Selecting this option returns control to the main menu of <strong>popLA</strong><br />
#2 Harmonic Analysis—Cubic<br />
mn<br />
Determines the harmonic coefficients Wl from a sample with cubic symmetry--even l only, to l=22. When<br />
this option is selected, <strong>popLA</strong> displays<br />
Pole figure analysis to fit Wlmn, cubic<br />
Harmonic method<br />
Program (c) John Kallend 1971, 1982<br />
(x) Pole Figures read in<br />
How many iterations on missing parts? 6<br />
Six or eight iterations is usually sufficient.<br />
Sample Symmetry<br />
0. Orthorhombic<br />
1. Mirror perpendicular to Z<br />
Enter 0 or 1 ==> 0<br />
After sample symmetry is entered, <strong>popLA</strong> determines the harmonic coefficients from the data. After the<br />
calculation is completed it will ask if you would like to print the harmonic coefficients to the screen. The output<br />
of this program is an .HCF file which contains the harmonic coefficients (in a binary format) <strong>and</strong> a .FUL file,<br />
which is a pole figure which has been extrapolated to low (non-measurable) angles using the harmonic<br />
coefficients determined during the analysis. Note that the .HCF file is not a density file like most of the files (i.e.<br />
pole figures) produced by <strong>popLA</strong>.<br />
#3 Harmonic Analysis—Lower Symmetry<br />
mn<br />
Determines the harmonic coefficients Wl (for l even, to 22) from a sample with orthorhombic, tetragonal, or<br />
hexagonal symmetry. It is necessary to know information about the unit cell because the sample is not cubic.<br />
The requests for input are self-explanatory.<br />
Pole figure analysis to fit Wlmn, non cubic<br />
Harmonic method<br />
Program (c) John Kallend 1971, 1982<br />
(x) Pole Figures read in<br />
How many iterations on missing parts? 6<br />
Six or eight iterations is usually sufficient.<br />
ODF Analysis for (file)<br />
Enter CRYSTAL SYSTEM code<br />
2=ORTHORHOMBIC, 4=TETRAGONAL, 6=HEXAGONAL<br />
Enter 2, 4, or 6 ===> 2<br />
(Program requests information about ratio of sides in the unit cell)<br />
Please enter sample symmetry:<br />
DETAILS 28
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