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中文摘要：
在CCSD（T）/6-311＋G（2d,2p）//B3LYP/6-311＋G（2d,2p）水平上对八种（H）FNO＋异构体的结构和异构化机理进行了研究.用分子生成密度差结合电子密度拓扑分析方法讨论了FNO质子化过程中的电子转移,结果显示FNO质子化过程中除HFNO＋中电荷由N,O原子向H,F原子转移外,其他七种异构体中均是H原子上电荷增加,F原子上电荷减小,说明电子由F向H转移.在八种（H）FNO＋异构体中,HFNO＋,FNOH-cis,FN（H）O＋和FNOH＋-trans能量较低,较稳定;异构体间通过H原子迁移、F原子迁移、分子内化学键转动及化学键的相对振动四种过程实现异构化,其中原子迁移过程的反应能垒很高,反应不容易进行.用电子定域函数（ELF）理论讨论了反应过程中化学键的变化.
英文摘要：
The structures and isomerization mechanisms of eight（H）FNO＋ isomers have been studied at CCSD（T）/6-311＋G（2d,2p）//B3LYP/6-311＋G（2d,2p） levels.The molecular formation density difference（MFDD） and the topological analysis of electron density theory were used to discuss the electron transfer in the protonated processes of FNO,the results show that expect for HFNO＋,the electron transfers from N,O atom to H,F atom,the other seven isomers,the electron density of H increased and that of F atom decreased,which means that the electron transfers from F atom to H atom.Among the eight isomers,HFNO＋,FNOH-cis,FN（H）O＋and FNOH＋-trans are the stable species because of their lower energies.The isomerizations of（H）FNO＋could be achieved by the migration of H atom or F atom,the rotation or vibration of chemical bond.Because the atom migration mechanism has the higher energy barrier,it could not achieve easily.The chemical bonds changes on the reaction paths are described by electron localization function（ELF）.
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