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Laser Desorption Ionization of Melamine and Identification of Fragmentation Channels from Ion Velocity Distribution Measurements
Authors:Chau-Chung Han  Ru-Wen Wang  Tieh-Sheng Lee
Abstract:Fragmentation frequently accompanies intact laser desorption ionization of a parent non-volatile compound, desorption and dissociation dynamics has been a subject of intense studies over the past decade. As a preliminary lest system for future laser desorption study of energetic compounds such as explosives and propellents, we studied UV laser desorption ionization of melamine at a laser power density of approximately 4.4 MW/cm2. Several gas-phase dissociation channels of the parent and fragment ions formed in UV laser desorption ionization of melamine films can be identified from their velocity distributions. A phenomenological desorption temperature of the order of 20000 K is estimated from fitting the experimental velocity distributions to Maxwellian functions.
Keywords:Laser desorption ionization  Mass spectrometry  Ion formation in laser desorption ionization
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