Calibrating a PSD Spectrum
8.3.1 Checking Peak Detection
Checking Before calibrating, check that peaks in all segment traces of interest are properly peak detected and that noise is not detected as peaks. Note the following when setting peak detection parameters:
•Peak detection settings are applied to the currently displayed composite spectrum or segment traces.
•The default peak detection settings (in VOYAGERPSD.SET) have different detection ranges for different mass ranges. You can fine tune ranges and Filter Width settings in ranges to optimize detection. For more information, see “Detection Ranges” on page
•Fragment ion peaks in segments collected with lower
PSD Mirror Ratios are broader and include more data | 8 |
points. Use a higher Filter Width setting for these | |
segments. |
•Within a segment, resolution increases with increasing mass, as the flight time of the fragment ions approaches the flight time of the precursor. Use a lower Filter Width setting for higher resolutions.
For more information, see Section 3.2, Peak Detection.
Smoothing If a segment appears noisy, smooth the trace (for example, use
Data Explorer™ Software User’s Guide |