
Obtaining Good Spectra in Continuous Extraction Mode
Voyager
™
Biospectrometry
™
Workstation User’s Guide H-9
H
Figure H-1 Example of Poor Mass Spectrum for Myoglobin Using Sinapinic Acid
Figure H-2 Example of Good Mass Spectrum for Myoglobin Using Sinapinic
Acid
High laser power causing the following:
Matrix peaks seen
with Low Mass Gate On
Sample mass slightly higher
than expected due to collision of ions
with excess neutrals generated
by the laser
Dimer
No separation
between molecular ion
and matrix adduct ion
Broad peak
Poor resolution
Excess chemical noise
(less than 100)
Laser power near threshold producing:
No matrix peaks seen
Minimal noise
Sharp, narrow peak
Dimer minimized
Good resolution
Good separation
between molecular ion
and matrix adduct ion
(greater than 350)
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