Download FeliX32 Operation Manual

The Start Parameters dialog box for the Ivv, Ivh Fit is shown below.
The Number of Lifetimes text box selects the
number of different lifetimes used to analyze the
decay curve. Select a number between 1 and 4.
Lifetime, Fix: For each of the lifetimes to be used
in the fit an initial guess for the lifetime must be
given. Each of the lifetimes chosen for the
analysis may be fixed at the input value or allowed
to float in the fit. Toggle this option on or off by
clicking on it. Occasionally, the fit will not
succeed if the starting values are very poor. If this
occurs, try changing the starting values.
Fix Shift: There may be a small time shift
between the sample and the scatterer decay curves
(see the General Introduction for details). This
shift may be included as a parameter in the analysis. The shift parameter may be fixed at
the input value or allowed to float in the fit. Toggle this option on or off by clicking on
it. If the shift is allowed to float, a value of 0.0 is used as the initial guess.
Fix Offset: Because of difficulties in establishing a noise free baseline there may be a
small intensity offset for a decay curve. This offset may be included as a parameter in the
analysis. The offset parameter may be fixed at the input value or allowed to float in the
fit. Toggle this option on or off by clicking on it. If the offset is allowed to float, a value
of 0.0 is used as the initial guess.
Study of the portion of the sample and scatterer
curves before the laser pulse may indicate whether
an offset is required. However, it is often better to
adjust the sample and scatterer curves to average
zero before the pulse (using math functions
provided in FeliX32) than to trust the fit. Once all
parameters have been set, click the OK button to
return to the previous dialog box and then Start Fit
to start the Analysis.
The Anisotropy Fit start parameters dialog box is
shown at left.
The Number of Lifetimes text box selects the
number of different lifetimes used to analyze the
r(t) curve. Select a number between 1 and 4.
Lifetime, Fix: For each of the lifetimes to be used
in the fit an initial guess for the lifetime must be
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