
Exploring PSD Mode
Voyager
™
Biospectrometry
™
Workstation User’s Guide 7-37
7
7.4.1 Observing the
Effects of Laser Intensity
Adjusting laser intensity affects fragment ion production and
signal intensity.
In this section
In this section, you will:
• Observe the effects of setting the laser intensity too high
and too low
• Determine the laser intensity for your system that yields
the best signal for PSD spectra
Observing effects
of high and low
laser intensity
To observe the effects of laser intensity:
1. Open the Angiotensin_PSD.BIC file provided.
2. In the PSD segment list, select the first row with a Mirror
Ratio setting of 1.0.
3. Acquire a spectrum.
4. Observe the 1,180 to 1,190 Da mass region for the
fragment ion cluster typically seen for angiotensin I
(Figure 7-9).
Figure 7-9 Angiotensin I Fragment Ions (Precursor Ion Selector On)
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