Voyager DP-263-S Guía de usuario Pagina 408

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Chapter 7 PSD Analysis
7-4 PerSeptive Biosystems
7
Figure 7-1 Molecular and Fragment Ion Flight in the
Reflector
The AH
+
fragment has 70 percent of the kinetic energy of the
MH
+
ion and the BH
+
ion has 30 percent. With a Mirror Ratio
setting of 1.0000, ions with lower kinetic energy are reflected
quickly and are not focused by the mirror.
Fragment ions with a lower energy than that of the precursor
ion can be focused by adjusting the voltage applied to the
mirror. Mirror Voltage is equal to:
You adjust the Mirror Voltage by decreasing the Mirror Ratio.
This adjusts the field strength of the mirror, and allows lower
energy ions to travel farther into the reflector portion of the
mass spectrometer and be better focused (Figure 7-2).
Reflector
from
ion
Mirror Ratio = 1.00
MH
+
(MW 1,000) correctly focused
AH
+
(MW 700) poorly focused
BH
+
(MW 300) poorly focused
MH
+
AH
+
BH
+
source
=
Mirror
Ratio
Mirror to Accelerating
Voltage Ratio
Accelerating
Voltage
xx
Mirror
Voltage
where:
Mirror Ratio is the value you set in PSD Acquisition Settings to focus
Mirror to Accelerating Voltage Ratio is a value set in the Advanced tab
unless instructed to do so by PerSeptive Biosystems.
Accelerating Voltage is the value you set in Instrument Settings.
fragment ions.
of Mode/Digitizer settings in Instrument Settings to adjust the
voltage of the mirror to reflect intact ions. Do not change this value
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