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Citation: Li Yue, Hu Yong-Jun, Lv Ri-Chang, Wang Xiu-Yan. Multiphoton lonization and Ab lnitio Calculation of C₄H₅N-(NH₃)_n Hydrogen-bond Clusters[J]. Acta Physico-Chimica Sinica, ;2000, 16(09): 810-817. doi: 10.3866/PKU.WHXB20000910 shu

Multiphoton lonization and Ab lnitio Calculation of C₄H₅N-(NH₃)_n Hydrogen-bond Clusters

1.
State Key Laboratory of Molecular Reaction Dynamics,Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023

Received Date: 11 January 2000
Available Online: 15 September 2000

Multiphoton ionization of binary clusters (C4H5N)－ NH3 at 355 and 532 nm have been investigated using a TOF mass spectrometer. The experimenal results showed that normal cluster ions and protonated cluster ions were produced at both laser wavelengths. The protonated products came from the intracluster proton transfer reaction. The existence of NH3 in the clusters increased the ionization cross sections of the clusters. The higher ionization efficiency at 355 nm results from the (2＋ 1) resonance multiphoton ionization of the pyrrole molecule. A peculiar low abundance of was observed, ab initio calculations indicated that when ammonia number n ≥ 3,two hydrogen bonds between ammnia chain and pyrrole ring can be formed, and the cluster become more stable. The channel ratio for the formation of protonated and unprotonated products increases with the increase of n,in agreement with the trend of proton affinity of (C4H5N)－ (NH3 )n.
- Multiphoton ionization,
- Pyrrole,
- TOF-MS,
- Binary cluster
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Multiphoton lonization and Ab lnitio Calculation of C4H5N-(NH3)n Hydrogen-bond Clusters

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Multiphoton lonization and Ab lnitio Calculation of C₄H₅N-(NH₃)_n Hydrogen-bond Clusters