Multiphoton ionization/dissociation dynamics of formyl fluoride by velocity mapping ion imaging
文献情報
Fengyan Wang, Yongwei Zhang, Hua Wang, Jie Liu, Bo Jiang, Xiuyan Wang, Xueming Yang
The dissociation dynamics of HFCO+ ion has been studied using the velocity map ion imaging technique. The HFCO+ ion is prepared by one-photon resonant three-photon ionization in the region of 43100–43860 cm−1 excitation energy. The HFCO+ ions, produced by multiphoton ionization, have sufficient internal energy to dissociate into the F and HCO+ fragments without further absorption of another photon. Images of HCO+ have been recorded at various excitation energies. It is noticed that the angular distributions of HCO+ change dramatically from parallel distribution to perpendicular distribution and then back to parallel distribution in a very narrow excitation energy region of 43 473–43 500 cm−1. Analysis of anisotropy parameters of βn (n = 2, 4 and 6) reveals that the electronic states in the three-photon excitation of HFCO are mainly: HFCO(X1A′) → HFCO(A1A″) → HFCO(A′) → HFCO+(A2A″;B2A′). The purely perpendicular resonant transitions are likely responsible for the perpendicular angular distribution of the HCO+ ion fragment.
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