CONFOCOR
3
Carl Zeiss
Models
ConfoCor 3
78 M60-1-0025
e
02/2010
9.9.4
PCH
In the PCH (Photon Counting Histogram) panel you
can determine concentrations and the molecular
brightness of molecules.
•
Click on the
PCH
tab to open the PCH control
panel (Fig. 72). Click on any other register to
leave the panel.
You have the following options:
−
You can enter a background value, if you
know the background in the
Background
display box. Enter a zero, if you assume no
background. The background is no fit
parameter.
−
You can choose between 1, 2 or 3 components by activating the
Components
1
,
2
and
3
buttons,
respectively for each activated component you can enter a brightness value in Hz in the
Specific
brightness
enter boxes. If you don’t know the brightness, enter 1.
−
You can enter
Instrumental parameters
values in the respective
first order
,
second order
and
third order
enter boxes. These values have to be determined in independent calibration
experiments using a defined dye solution with a known brightness. The parameters correct for the
deviation of the confocal volume from a true Gaussian distribution. Normally, only a correction for
the first order parameter is necessary and recommended. Hence, in the calibration fit you will keep
the first order parameter free and the second and third parameters fixed to zero. You can enter the
determined first order number and fix it for later measurements.
Fig. 72
Model panel, PCH tab