What exactly do you want to know about it? In a short synopsis, basically you are just bombarding your molecule with high energy electrons. These electrons essentially fragment your molecule at spots that lead to the part of the compound obtaining a dot, the other a positive charge. Obviously the readings you obtain indicate the fragments that receive a positive charge. You have to just have a general understanding of the major fragment breaks, as well as what pieces of the compound will fall apart first. For example, if you have flanking methly groups off your compounds, you would probably see a -15 m/z from your parent peak, etc. The major ones to know are -43, which indicates a acyl group, etc. Let me know what else you want to know. It is hard to explain without examples and time to sit down and review the fragment breaks.
