PerkinElmer Clarus SQ 8 MS Series, Hardware Manual

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Clarus SQ 8 MS Hardware Guide
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keep the source cleaner, but may increase
fragmentation.
For example, down a little from EI to minimize
fragmentation. 120
°
C is the practical lower limit.
Ion Energy Approx. 1 or 2
2.
Optimize the amount of reagent gas flowing into the source by using two
heptacosa ions, m/z 452 and 633, which usually produce relative intensities of
65 – 85% and 95% respectively.
Heptacosa can be used to calibrate the m/z range for negative ion CI analyses.
3.
Maximize the peak intensities, then slightly decrease the reagent gas by turning
the knob clockwise 1/8 turn.
Optimize the tuning parameters for maximum intensity.
4.
Save the Tune page parameters by selecting
Save As…
from the File menu.
5.
Select
Calibrate Instrument
from the Tune page Calibration menu.
6.
Select
heptaneg.ref
from the drop-down menu.