Citation:
ZHEN Cheng, TANG Xiao-Feng, ZHOU Xiao-Guo, LIU Shi-Lin. Application and Improvement in the Ion Velocity Imaging of Threshold Photoelectron-Photoion Coincidence Measurements[J]. Acta Physico-Chimica Sinica,
;2011, 27(07): 1574-1578.
doi:
10.3866/PKU.WHXB20110633
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A series of electrodes were used to form a new accelerated electric field for ion focusing optics of a threshold photoelectron-photoion coincidence (TPEPICO) mass spectrometer. Ion groups with higher kinetic energy gradually expanded along the direction of flight while they were restricted along the direction perpendicular to the flight tube. Consequently, contractible velocity imaging was achieved on the surface of the detector for all the ions where a magnification factor (N) of less than 1 was obtained for the images. Therefore, od kinetic energy resolution and mass resolving power were obtained simultaneously. Using this novel focusing lens the dissociation of vibrational state-selected O2 ions in the B2Σg- state was reinvestigated and three-dimentional time-sliced velocity images of the O fragment were recorded. By comparing the kinetic energy released distributions of the O that dissociated from the two dissociation channels, satisfied velocity imaging was obtained for the ions with a wide kinetic energy range.
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