Fragmentation Mechanism of Fullerenes in the Positive and Negative Ion Channels

孔庆宇; 赵利; 庄军; 钱士雄; 李郁芬

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Fragmentation Mechanism of Fullerenes in the Positive and Negative Ion Channels

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We have performed the photofragmentation studies of pristine C60 and C60/C70 composites on the reflectron time-of-flight mass spectrometer (RTOF MS) in the positive and negative ion channels. The mechanism of the formation of daughter fullerenes in the negative ion channel and the enhancement of fullerene coalescence reactions have been discussed and compared to our previous studies on the linear TOF. The 5 cm free expansion path in the RTOF experiments provides sufficient time and a favourable environment for the electrons to attach to the neutral daughter species, so it is thought to play a key role for the appearance of strong mass peaks of anionic fragmentation and aggregation fullerene products. The appearance of odd-numbered "fullerene" fragments is briefly discussed.

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《中国物理快报：英文版》 |2001年第8期|1056-1059|共4页
作者
孔庆宇; 赵利; 庄军; 钱士雄; 李郁芬;
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State Key Joint Laboratory for Materials Modification by Laser, Ion and Electron Beams,and Department of Physics, Fudan University, Shanghai 200433;

State Key Joint Laboratory for Materials Modification by Laser, Ion and Electron Beams,and Department of Physics, Fudan University, Shanghai 200433;

State Key Joint Laboratory for Materials Modification by Laser, Ion and Electron Beams,and Department of Physics, Fudan University, Shanghai 200433;

State Key Joint Laboratory for Materials Modification by Laser, Ion and Electron Beams,and Department of Physics, Fudan University, Shanghai 200433;

State Key Joint Laboratory for Materials Modification by Laser, Ion and Electron Beams,and Department of Physics, Fudan University, Shanghai 200433;

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中图分类物理学;
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Fragmentation Mechanism of Fullerenes in the Positive and Negative Ion Channels

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