Ion kinetic energy spectroscopy of the doubly-charged ion of carbon monoxide
Ion kinetic energy spectroscopy of the doubly-charged ion of carbon monoxide
复制标题
一氧化碳双电荷离子的离子动能谱
DOI：
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发表时间：
1984
期刊：
影响因子：
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通讯作者：
R. Boyd
中科院分区：
文献类型：
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作者：
J. Curtis;R. Boyd
利用离子动能谱技术，在双聚焦质谱仪上研究了电子碰撞形成的Co2+离子的自发解离和碰撞诱导解离过程。预解离过程在微秒时间尺度上负责Co2+的单分子解离，几乎可以肯定是电子绝热隧穿势垒，尽管不能完全排除通过电子曲线交叉进行预解离的可能性。为了更好地适应所有可用的数据，对Co2+态的半经验势能曲线进行了修正，包括俄歇光谱、出现能和动能释放。与Ar、N2和H2的碰撞诱导解离过程通过电荷交换进行，并涉及CO+的C 2Π态对D 2Δ态的预解离。当用He作为碰撞气体时，涉及电荷交换的解离过程是不同的，需要相对动能(Kine)的能量贡献。
Spontaneous and collision‐induced dissociation processes of CO2+ ions, formed by electron impact, have been studied in a double‐focusing mass spectrometer using techniques of ion kinetic energy spectroscopy. The predissociation process, responsible for unimolecular dissociation of CO2+ on the microsecond time scale, is almost certainly electronically adiabatic tunneling through a potential barrier, though predissociation via electronic curve crossing cannot be entirely ruled out. Semiempirical potential curves for states of CO2+ were revised in order to better accommodate all of the available data, including Auger spectra, appearance energies, and kinetic energy release. Collision induced dissociation processes with Ar, N2, and H2 proceed via charge exchange, and involve predissociation of the D 2Π state by the C 2Δ state of CO+. When He is used as collision gas, the dissociation processes involving charge exchange are different, and require an energetic contribution from the relative kinetic energy (kine...