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Double Imaging Photoelectron Photoion Coincidence Sheds New Light on the Dissociation of State-Selected CH3F+ Ions
Tang, Xiaofeng1,2; Garcia, Gustavo A.2; Nahon, Laurent2
2017-08-10
发表期刊JOURNAL OF PHYSICAL CHEMISTRY A
卷号121期号:31页码:5763-5772
摘要The vacuum ultraviolet (VUV) photoionization and dissociative photoionization of methyl fluoride (CH3F) in the 12.2-19.8 eV energy range were investigated by using synchrotron radiation coupled to a double imaging photoelectron photoion coincidence (i(2)PEPICO) spectrometer. The production of several fragment ions including CH2F+, CHF+, CH3+, and CH2+ as a function of state and internal energy of CH3F+ ions was identified and analyzed, with their individual appearance energies measured through threshold photoelectron spectroscopy. Dynamical information was inferred from electron and ion kinetic energy correlation diagrams measured at chosen fixed photon energies. The detailed mechanisms governing the dissociation of state-selected CH3F+ ions prepared in the (XE)-E-2, A(2)A(1), and (BE)-E-2 low-lying electronic states as well as outside the Franck-Condon region have been inferred based on the present experimental results and existing theoretical calculations. Both the CH2F+ and CH3+ primary fragment ions have three different channels of production from different electronic states of CH3F+. The spin-orbit splitting states of the F fragment, P-2(3/2) and P-2(1/2), in the CH3+ + F dissociation channels were assigned and adiabatically correlate to the (XE)-E-2 ground state and the A(2)A(1) electronic state, respectively, with the aid of previous theoretical results. The CH3F+ ions in the high energy part of the (XE)-E-2 ground state are unstable and statistically dissociate to the CH2F+ (1(1)A(1)) and H(S-2) fragments along the potential energy curve of the (XE)-E-2 state. The A(2)A(1) electronic state is a repulsive state and exclusively dissociates to the CH3+ (1(1)A(1)') and F(P-2(1/2)) fragments. In addition, the CH2F+, CHF+, CH3+, and CH2+ fragment ions are also produced in the (BE)-E-2 state and in the Franck-Condon gap by indirect processes, such as internal conversion or dissociative autoionization.
文章类型Article
WOS标题词Science & Technology ; Physical Sciences
资助者National Natural Science Foundation of China(91644109) ; National Natural Science Foundation of China(91644109) ; National Key Research and Development Program of China(2016YFC0200300) ; National Key Research and Development Program of China(2016YFC0200300) ; Natural Science Foundation of Anhui Province(1608085MB35) ; Natural Science Foundation of Anhui Province(1608085MB35) ; (20140090) ; (20140090) ; (20130969) ; (20130969) ; National Natural Science Foundation of China(91644109) ; National Natural Science Foundation of China(91644109) ; National Key Research and Development Program of China(2016YFC0200300) ; National Key Research and Development Program of China(2016YFC0200300) ; Natural Science Foundation of Anhui Province(1608085MB35) ; Natural Science Foundation of Anhui Province(1608085MB35) ; (20140090) ; (20140090) ; (20130969) ; (20130969)
DOI10.1021/acs.jpca.7b06038
关键词[WOS]METHYL-FLUORIDE ; ELECTRONIC STATES ; GAS-PHASE ; ENERGY ; IONIZATION ; MOLECULE ; FLUOROMETHANES ; DISTRIBUTIONS ; SPECTROSCOPY ; RESOLUTION
收录类别SCI
语种英语
资助者National Natural Science Foundation of China(91644109) ; National Natural Science Foundation of China(91644109) ; National Key Research and Development Program of China(2016YFC0200300) ; National Key Research and Development Program of China(2016YFC0200300) ; Natural Science Foundation of Anhui Province(1608085MB35) ; Natural Science Foundation of Anhui Province(1608085MB35) ; (20140090) ; (20140090) ; (20130969) ; (20130969) ; National Natural Science Foundation of China(91644109) ; National Natural Science Foundation of China(91644109) ; National Key Research and Development Program of China(2016YFC0200300) ; National Key Research and Development Program of China(2016YFC0200300) ; Natural Science Foundation of Anhui Province(1608085MB35) ; Natural Science Foundation of Anhui Province(1608085MB35) ; (20140090) ; (20140090) ; (20130969) ; (20130969)
WOS研究方向Chemistry ; Physics
WOS类目Chemistry, Physical ; Physics, Atomic, Molecular & Chemical
WOS记录号WOS:000407656100001
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文献类型期刊论文
条目标识符http://ir.hfcas.ac.cn:8080/handle/334002/33603
专题中科院安徽光学精密机械研究所
作者单位1.Chinese Acad Sci, Anhui Inst Opt & Fine Mech, Lab Atmospher Phys Chem, Hefei 230031, Anhui, Peoples R China
2.Synchrotron SOLEIL, Orme Merisiers, St Aubin BP 48, F-91192 Gif Sur Yvette, France
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Tang, Xiaofeng,Garcia, Gustavo A.,Nahon, Laurent. Double Imaging Photoelectron Photoion Coincidence Sheds New Light on the Dissociation of State-Selected CH3F+ Ions[J]. JOURNAL OF PHYSICAL CHEMISTRY A,2017,121(31):5763-5772.
APA Tang, Xiaofeng,Garcia, Gustavo A.,&Nahon, Laurent.(2017).Double Imaging Photoelectron Photoion Coincidence Sheds New Light on the Dissociation of State-Selected CH3F+ Ions.JOURNAL OF PHYSICAL CHEMISTRY A,121(31),5763-5772.
MLA Tang, Xiaofeng,et al."Double Imaging Photoelectron Photoion Coincidence Sheds New Light on the Dissociation of State-Selected CH3F+ Ions".JOURNAL OF PHYSICAL CHEMISTRY A 121.31(2017):5763-5772.
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