source: trunk/User form factors for Irena/README.md @ 664

Last change on this file since 664 was 664, checked in by ilavsky, 4 years ago

Fixed Unified fit Analyze Uncertainty error on Igor 8.

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[664]1# User form factors for Modeling tool
2These are user contributed - or requested - form factors for use in "User Form factor" in Modeling package in Irena.
3To use:
41. Download the ipf file you need - click on the file, it opens in new type of view, now click in the right corner of the frame button "Raw", opens in text view. Now "Save as" from your browser File menu and save as text file with extension ipf (remove .txt browsers attach.)
52. Open this ipf file in Igor Experiment where you want to use it. Either double click with Igor Pro opened, or in Igor Pro go to File menu, Open File, Procedure...
63. Keep the ipf file in that experiment, if needed minimize or hide, do NOT kill
74. Follow these instructions below to setup that specific Form factor
8
9
10### Core Shell Ellipsoid, June 2018
11This is modified version of NIST CoreShellEllipsoid, created by Jan Ilavsky in June 2018. Original author is Steven Kline from NIST.
12
13USE in Irena :
14* In Modeling II select User form factor
15* In panel put in "Name of ForFactor function this string:    IR1T_EllipsoidalCoreShell
16* In Panel put in Name of volume FF function this string:     IR1T_EllipsoidalVolume
17* Par1 is the aspect ratio which for ellipsoids are defiend as rotational objects with dimensions R x R x ARxR, note, AR=1 may fail.
18* Par 2 is shell thickness in A, and it is the same thickness everywhere on the ellipsoid.
19* Par3, 4 and 5 are contrasts as this is core shell system and contrasts are part of the form factor.
20* Par3, 4 and 5 are implicitelyu multipled by 10^10cm^-2, so insert only a number. These are rhos not, delta-rho-square
21* In main panel set contrast = 1 !!!!! Contrasts are part of the form factor in this case.
22
23
24### Flexible Cylinder, June 2018
25This is modified version of NIST Flexible Cylinder, created by Jan Ilavsky in June 2018. Original author is Steven Kline from NIST.
26
27USE in Irena :
28* In Modeling II select User form factor
29* In panel put in Name of FormFactor function this string:    IR1T_FlexExclVolCyl
30* In Panel put in Name of volume FF function this string:    IR1T_FlexExclVolCylVol
31* Parameter 1 is the length of the cylinder
32* Parameter 2 is the Kuhn length
33* other parameters are not being used.
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