頁籤選單縮合
題名 | Laser Desorption Ionization of Melamine and Identification of Fragmentation Channels from Ion Velocity Distibution Measurements= |
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作者 | 韓肇中; 王如文; 李鐵生; Han, Chau-chung; Wang, Ru-wen; Lee, Tieh-sheng; |
期刊 | Journal of the Chinese Chemical Society |
出版日期 | 19980400 |
卷期 | 45:2 1998.04[民87.04] |
頁次 | 頁229-235 |
分類號 | 340 |
語文 | eng |
關鍵詞 | Laser desorption ionization; Mass spectrometry; Ion formation in laser desorption ionization; |
英文摘要 | Fragmentation frequently accompanies intact laser desorption ionization of a parent non-volatile com pound, 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 propellents, we studied UV laser desorption ionization of melamine at a laser power density of approximately 4.4 MW/cm□. 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 20000K is estimated from fitting the experimental velocity distributions to Maxwellian functions. |
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