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Obtaining Good Spectra in Continuous Extraction Mode
Voyager
Biospectrometry
Workstation User’s Guide H-11
H
Parameters
affecting
resolution and
signal-to-noise
ratio
These parameters have a primary impact on resolution and
signal-to-noise ratio in Continuous Extraction mode:
Laser position on the sample (hot or cold spot)
Laser intensity
These parameters have a secondary impact on resolution and
signal-to-noise ratio in Continuous Extraction mode:
Digitizer setting
Accelerating Voltage
Grid Voltage%
Guide Wire Voltage%
To obtain suitable mass spectra, you may need to adjust these
parameters in conjunction with each other. See Section H.1,
Optimizing a Continuous Extraction Standard Instrument
(.BIC) Setting, for more information.
Laser threshold
You see the best resolution at
laser threshold
, the minimum
laser intensity required to produce a steady detectable signal.
NOTE: High mass compounds may require a higher laser
intensity to ionize the sample than low mass compounds.
You may see the best overall spectrum (good resolution and
good signal-to-noise ratio) at a setting slightly higher than
threshold.
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