Dynamic Ramps UI
Dynamic ramping allows you to change the voltage of the analyzer
components listed below for selected m/z. For EI of PFTBA, ion masses
exist at m/z 50, 69, 131, 219, 414, and
502. The end points of 2.6 AMU and 1049 AMU only represent the ends
of the mass range and are not in the standard EI calibration compound.
The effect is to change the ion abundance surrounding a specified
ion. If the results of a target tune indicate that you want to change
the abundance of a particular ion, change the specified voltage and
review your results.
Dynamic Ramping analyzer
components
- Width Offset - This affects the width of the mass peaks by
adjusting the ratio of dc voltage to RF voltage on the mass filter.
A higher value gives narrower peaks at all masses.
- Repeller - This voltage
repels ions from the ion source. If the voltage is set too low,
too few ions will leave the source, resulting in poor sensitivity
and poor high mass response. If it is set too high, too many ions
at too high a velocity will leave the source. This results in
precursors (poor mass filtering) and poor low mass resolution.
- Ion Focus - Ion focus
affects ion abundance.
- Entrance Lens - This
Voltage (V) value is actually the
voltage gain (mV/amu) per unit mass that combined with the Ent Lens Offset voltage determines the voltage
that is applied to the entrance lens.
- Ent Lens Offset - Increase
this voltage to increase the abundance of ions at low masses without
substantially decreasing the abundance of ions at high masses.