xvi Table of Contents
9 FI/FD Operation ..................................................................................... 9-1
Introduction ....................................................................................................... 9-2
Preparing the instrument for FI/FD Operation ........................................ 9-2
Choosing an emitter for the FI/FD inner source............................................ 9-2
Setting-up for FI/FD operation ...................................................................... 9-3
Changing the FI/FD outer source assembly................................................... 9-3
Changing the FI/FD inner source assembly................................................... 9-7
Installing the FI/FD inner source direct insertion probe only flange........... 9-9
Changing the FI/FD GC interface................................................................. 9-14
Positioning the GC column for FI operation ................................................ 9-18
Tuning in FI mode .......................................................................................... 9-20
Introducing the reference sample................................................................. 9-21
Obtaining a beam and tuning in FI operation ............................................. 9-21
General considerations for tuning in FI mode ........................................ 9-23
Lens tuning.................................................................................................... 9-23
Setting up and calibrating the instrument ............................................... 9-24
Instrument setup in FI mode........................................................................ 9-24
Calibrating and accurate mass in FI mode.................................................. 9-24
Optimization of FI calibration....................................................................... 9-25
Running samples ............................................................................................. 9-26
Running MS samples in GC FI mode ........................................................... 9-26
Using direct insertion probe in FI mode....................................................... 9-26
Tuning in FD mode ......................................................................................... 9-27
Obtaining a beam in FD operation............................................................... 9-27
Introducing the sample.................................................................................. 9-28
Calibration and setup in FD ......................................................................... 9-29
Running an FD experiment manually.......................................................... 9-29
Running an FD experiment using the probe ramp...................................... 9-30
Loading the FD inner source probe with sample......................................... 9-32
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