- 作者: Chau-Chung Han, Ru-Wen Wang and Tieh-Sheng Lee
- 中文摘要: 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 test system for future laser desorption study of energetic compounds such as explosives and propellants, 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.
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