- 作者: 蔡文進 ; 葉維弘 ; 曾文碧
- 作者服務機構: 中央研究院原子與分子研究所
- 中文摘要: Neutral benzene-ammonia clusters, prepared in a supersonic expansion, were ionized using multiphoton ionization. The cluster ions were investigated with a time-of-flight mass spectrometer. The observed major cluster ions, under 355nm laser irradiation, resulting from prompt intracluster ion-molecule reaction and fragmentation following ionization are (C/sub 6/H/sub 6/)/sub m/(NH/sub 3/)/sub n/H/sup +/, m=1-6, n=1-4 and (C/sub 6/ H/sub 6/)/sub m//sup +/, m=1-3. The results of isotopic labeling experiments clearly indicate that C/sub 6/H/sub 6/ does not participate in intracluster ion-mole-cule reactions to form (C/sub 6/H/sub 6/)/sub m/(NH/sub 3/)/sub n/H/sup +/. A local maximum appears at n=2 in the intensity distribution of (C/ sub 6/H/sub 6/)/sub m/(NH/sub 3/)/sub n/H/sup +/ for each value of m under all experimental conditions. This finding indicates that(C/sub 6/H/sub 6/)/sub m/(NH/sub 3/)/sub 2/H/sup +/ is more stable than any other (C/sub 6/H/sub 6/)/sub m/(NH/sub 3/)/ sub n/H/sup +/ (n=1, 3, 4) for m=1-6.
- 英文摘要: --
- 中文關鍵字: Multiphoton Ionization; Intracluster Reaction; Cluster Ion Stability; Time-Of-Flight Mass Spectrometry; Isotopic Labeling
- 英文關鍵字: 多光子離子化;簇內反應;簇離子穩定性;飛行的時間質譜測定術;同位素標識