software to fit optical spectra - Quantum Materials Group

“Wp” – plasma frequency;
“G” – linewidth.
SourceLorNo Integer The number of the source
Lorentian (starting from 1). It is
ignored, if
SourceParamName=”Einf”
No action is taken in
case
SourceParamName =
”Wo”, “Wp” or “G”
Command name: FixAllModelParams
Description: Makes all the parameters of the specified model not active in fitting (fixed).
Note: it is nice to use this command when one has to adjust a model using one set of data and
then to use it for other purposes without fitting. For example, when extracting optical properties
of a thin film, it is common to obtain first the dielectric function of the substrate from an
independent measurement and then to use it as known (fixed) while analyzing spectra measured
on the ‘film-substrate’ system.
Parameters:
Name Type Description What if omitted
ModelNo Integer Model identity number No action is taken
Command name: FreeShape
Description: Emulates the pressing of buttons F4, F5, F6 and F7 in the model window. Note:
these buttons are used to set up the so called variational, or ‘free-shape’, dielectric function (see
section 4.6.3).
Parameters:
Name Type Description What if omitted
ModelNo Integer Model identity number No action is taken
Key Text Specifies the button to be emulated:
“F4”, “F5”, “F6” or “F7”
No action is taken
4.11.6. Graph macro commands
Command name: NewGraph
Description: Creates a new graph; moves and resizes the graph window.
Note: when a new graph is created, it is automatically ascribed an identity number, which starts
from 1 and increments for every new graph. It can be seen in the window title, e.g. graph #5
has title “Graph5”. This number is used by other commands to identify this graph.
Parameters:
Name Type Description What if omitted
XPos Integer Horizontal position of the left side (in The default value is
screen pixels)
assumed
Guide to RefFIT Page 87