ABSTRACT
This chapter takes a look at the inductively coupled plasma mass spectrometer (ICP-MS) interface region, which is probably the most critical area of the entire ICP-MS system. This is first achieved by directing the ions into the interface region. This discharge, commonly called the pinch effect or secondary discharge, shows itself as arcing in the region where the plasma is in contact with the sampler cone. After many experiments, it was eventually realized that the secondary discharge was a result of electrostatic coupling of the load coil to the plasma. However, they all appear to work equally well when it comes to using cool plasma conditions requiring higher radio frequency power and lower nebulizer gas flow. It is well documented that the energy spread of the ions entering the MS must be as low as possible to ensure they can all be focused efficiently and with full electrical integrity by the ion optics and the mass separation device.
