Teledyne Princeton Instruments PI-MAX 3, System Manual

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104 PI-MAX
®
3 System Manual Issue 2
8.4 Additional Experiments
Figure 8-3 illustrates the kinds of experiments that can be performed with a PI-MAX3
detector.
Figure 8-3: Typical PI-MAX3 Experiments
Of the many gated measurements that can be performed with a PI-MAX3, most will fall
in one of the following categories:
• Static Gate
This type of experiment may also be referred to as Repetitive-Continuous.
There is a repetitive trigger, and the Gate Width and Gate Delay are fixed.
A variable in the experiment (e.g., pressure, concentration, wavelength, or
temperature,) is varied.
• Swept Gate
In this type of experiment, Gate Width, Gate Delay, or both may be varied.
— Repetitive-Sequential 1
The Trigger is repetitive, Gate Width is fixed, and Delay is varied over the
course of the measurement.
The result of the experiment is a plot of intensity vs. time, such as might be
obtained with a sampling oscilloscope. This technique is used to measure
lifetime decays.
— Repetitive-Sequential 2
The Trigger is repetitive and Gate Width and Delay are varied over the
course of the measurement.
Gate Width and Delay can be incremented in a linear fashion or in an
exponential fashion. Increasing the Gate Width is useful for trying to find
fine detail in a weak decaying signal. If you choose linear, you have to take a
lot more points. Exponential lets you take data points closer together where
the signal is changing rapidly and further apart where the signal is changing
slowly.
CW
Cooled Photocathode
Photon Starved
Static Gate
fixed gate width & delay
3rd variable
(pressure, temperature, b
0
)
Swept Gate
sweep gate delay
sweep gate width
sweep both
(linear or exponential)
Kinetics
Slow (10 ms to 100 ms)
Multiple Spectra
Single Shot
Kinetics
Fast (ns)
F.O. delay array
2 ns to 100 ns
Repetitive One Shot
Gated
Single Shot
Streak
Camera
All I
CCD
Experiments
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