Voyager DP-263-S Betriebsanweisung Seite 443

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Seitenansicht 442
Exploring PSD Mode
Voyager
Biospectrometry
Workstation User’s Guide 7-39
7
Hint: As you initially experiment, adjust the laser in
large steps, for example 100 counts. As you begin to
fine-tune the laser, use smaller steps.
Fragment ion yield initially increases with higher laser
intensities, and then decreases at very high settings. To
make sure that the signal decrease is not due to
sample exhaustion, move around in the sample
position.
7. Decrease the laser intensity and observe the signal.
Signal intensity decreases with lower laser intensities.
When laser intensity is too low, signal intensity is weak.
8. Continue decreasing the laser intensity until signal is no
longer visible.
9. Continue experimenting with laser settings until you are
familiar with the appearance of a spectrum acquired when
the laser intensity is set too high or too low.
Determining
optimum laser
intensity for
fragments
Fine-tune the laser setting until you find a laser intensity that
provides a signal strength for the angiotensin I fragment ions
observed between 1,180 and 1,190 Da that is around 20,000
to 40,000 counts in the Spectrum window.
Record this laser setting.
NOTE: The precursor ion peak will be saturated at a laser
intensity that yields adequate intensity for fragment ions.
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