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Modification of Reflectron Time-of-Flight Mass Spectrometer for Photodissociation of Mass-Selected Cluster Ions
Yu-chao Zhao, Zeng-guang Zhang, Jin-yun Yuan, Hong-guang Xu, Wei-jun Zheng*
Beijing National Laboratory for Molecular Science, State Key Laboratory of Molecular Reaction Dynam-ics, Institute of Chemistry, Chinese Academy of sciences, Beijing 100190, China
Abstract:
We introduce a modification of reflectron time-of-flight mass spectrometer for laser photodis- sociation of mass-selected ions. In our apparatus, the ions of interests were selected by a mass gate near the first space focus point and decelerated right after the mass gate, were then crossed by a laser beam for dissociation. The daughter ions and surviving parent ions were re-accelerated and analyzed by the reflectron time-of-flight mass spectrometer. Compared to the designs reported by other research groups, our selection-deceleration-dissociation-reacceleration approach has better daughter-parent-ions-separation, easier laser timing, and better overlapping between the ion beam and laser beam. We also conducted detailed calculations on the parent ion and daughter ion flight times, and provided a simplified formula for the calibration of daughter ion mass.
Key words:  Reflectron time-of-flight mass spectrometer, Photodissociation, Mass-selection, Cluster
FundProject:
Modification of Reflectron Time-of-Flight Mass Spectrometer for Photodissociation of Mass-Selected Cluster Ions
赵雨超, 张增光, 袁金云, 许洪光, 郑卫军*
北京分子科学国家实验室(筹),中国科学院化学研究所分子反应动力学国家重点实验室,北京100190
摘要:
介绍了一种改进的反射式飞行时间质谱装置用于光解质量选择的团簇离子. 该装置中采用了\选质-减速-解离-再加速"的方式. 团簇离子在反射式飞行时间的一级聚焦点被选质,接着被减速,并且立即被光解,光解所产生的碎片以及没有被光解的母体离子被重新加速,这一系列过程都在靠近一级聚焦点的位置完成. 相对文献中报道的其他方式,采用这一方式更利于光解碎片和母体离子的分离,更容易确定光解激光的触发时间,同时,由于母体离子在一级聚焦点的空间分布比较窄,也有利于光解激光束照射到所有的团簇离子,从而提高光解效率. 对母体离子、碎
关键词:  反射式飞行时间质谱,激光光解,质量选择,团簇
DOI:10.1088/1674-0068/22/06/655-662
分类号: