Voyager DP-263-S Guia do Utilizador Página 538

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Appendix H Continuous Extraction Mode
H-10 PerSeptive Biosystems
H
Figure H-3 Example of Poor Mass Spectrum for Angiotensin
Figure H-4 Example of Good Mass Spectrum for Angiotensin
High laser power causing the following:
Matrix and sample peaks saturated
(flat-topped)
Minor components
Excess chemical noise
or fragments of major components ionized
Broad peak
Poor resolution
Sample mass slightly higher
than expected due to collision of ions
with excess neutrals generated
by the laser
Laser power near threshold producing:
Well-resolved matrix peaks
at 172, 190, and 379 Da
Correct mass of
sample peak
No minor
Good resolution
Sharp, narrow peak
Minimal noise
Peaks not saturated
(greater than 400)
components
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