Part 1 included many questions and some answers about the maximum abundance that should be detected at the electron multiplier. Another important consideration is how much sample should go into the column.
See Which Electron Io...
Do you know about the maelstrom of molecules, atoms, ions, and electrons that are going on inside a GC/MS Electron Ionization ion source?
The molecules streaming out of the end of the column in molecular flow come out at approximately the speed of so...
An electron multiplier is a device used to multiply the signal of electrons on the mass spectrometer. The signal is sent to a digitizer, which produces the abundance seen on the computer. When an ion reaches the end of the ion beam, it is strongly attracted to a high-energy dynode (HED) which carries a strong opposite charge to the charge of the ion. For example, if the ion is positive the dynode is charged in negative…
What is a “High Nitrogen” Value and How to Identify Possible Causes and Solutions
Air is 78.09 % Nitrogen and 20.95 % Oxygen or approximately a 4:1 ratio.
Nitrogen in the MS ion source significantly reduces the sensitivity. You woul...
How Does Carrier Gas Flow and Vacuum Work Together in GC/MS
A diagram of the GC Split/Splitless inlet is shown. Gas is compressible, so to change the flows and pressures in the entire inlet subsystem quickly and accurately requires enough chang...
How to Identity the Root Cause of Common GC/MS Issues
Ion Ratio/Spectral Tilt
Tune Ion Peak Shape
Chromatographic Peak Shape
Where can problems in your GC/MS System occur? How can you identify what part of the GC/MS system you should be troub...
I’m the first GCMS blogger for the Agilent Customer Community and this is article number 1. We’ll navigate through the GCMS talking about how it works and what needs to be done to keep one running smoothly. That is going...