Modification of Reflectron Time-of-Flight Mass Spectrometer for Photodissociation of Mass-Selected Cluster lons

• Published in: Chinese journal of chemical physics Vol. 22; no. 6; pp. 655 - 662
• Main Author: Yu-chao Zhao Zeng-guang Zhang Jin-yun Yuan Hong-guang Xu Wei-jun Zheng
• Format: Journal Article
• Language: Chinese
• Published: 2009
• Subjects: 光解; 改性; 激光束; 离子分离; 群集; 质量; 飞行时间; 飞行质谱
• ISSN: 1674-0068

We introduce a modification of reflectron time-of-flight mass spectrometer for laser photodissociation 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 cal- culations on the parent ion and daughter ion flight times, and provided a simplified formula for the calibration of daughter ion mass.