Fluorolog-3 v. 2.2 (11 Jul 2002)
Determining the Plateau Voltage
12-4
1
Open the programmable excitation shutter by
clicking on the shutter icon.
2
Enter 650 V in the S voltage text box.
3
Click on the right arrow on the
Continuous
area.
This records data in Prompt-Step mode (see the DataMax
manual for details).
4
Record the signal in cps at 650 V in a table such
as the one shown on a previous page.
This intensity will be the same value as the intensity at the peak of the water
Raman scan acquired, using right-angle detection and the specific high voltage.
5
Close the shutter by sliding it to the right.
This closes the manual shutter on the variable exit slit of the emission
spectrometer.
6
Record the dark counts at 650 V.
Write this value next to the signal intensity in your table.
7
Open the shutter by sliding it to the left.
8
Change the high voltage of the signal detector
from 650 V to 700 V.
9
Repeat steps 3 through 8,
increasing the signal detector voltage by 50 V each time and recording the
signal intensity and the corresponding dark counts.
The sample data below were acquired using a Fluorolog
®
Model FL212
equipped with a 450-W xenon lamp and an uncooled signal detector.
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