© Ultrafast Systems LLC /Vernier Software & Technology
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4.3 Software
Description
The user interface of the Vernier Flash Photolysis Spectrometer Software is rather intuitive
(Figure 4). The I
0
value (PD level, V) at the top-right of the screen reflects the amount of probe light
reaching the detector photodiode. Please keep in mind that at 2500 mV the detector will saturate, and
your signal will be distorted. A typical I
0
should not be larger than 2 V for absorption measurements. If the
I
0
values are lower than 500 mV or higher than 2000 mV, please contact Vernier Technical Support. For
emission measurements, the LED light turns off and the I
0
value should drop close to zero (<10 mV).
During data acquisition, the Vernier Flash Photolysis Spectrometer will wait for approximately
2 seconds between flashes to allow enough time for the flash capacitors to recharge. By default, the
software will adjust the axis scales automatically: the y-axis range will adjust to display the signal only,
cutting off the large scattered flash pulse around time = 0. The default x-axis setting is “Auto Scale.” To
change this, right-click anywhere on the plot and choose the desired option. Alternatively, you can use the
graph controls on the top of the screen (Figure 4).
The data are saved in CSV (comma delimited values) ASCII format. The first column is time in
milliseconds and the second column is light intensity in millivolts.
Figure 4:
Screenshot of Vernier Flash Photolysis Spectrometer Software
