Low-voltage weak-field accelerated ion imaging small-scale photolytic fragment translational velocity spectrometer

Abstract

The present invention relates to a low-voltage weak field accelerated ion imaging type miniature photodecomposition fragment translational velocity spectrometer. The low-voltage weak field accelerated ion imaging type miniature photodecomposition fragment translational velocity spectrometer comprises a source chamber, a reaction chamber, a vacuum pump, a pulse valve, a collimator, a photodecomposition laser, an ionization laser, a low-voltage weak field ion acceleration and focusing system, a microchannel board, a fluorescent screen, a data acquisition system, a sequential control system and a computer. The miniature photodecomposition fragment translational velocity spectrometer of the application innovatively uses a weak electric field (10-30 V / cm) to accelerate the ions and focuses the ions simultaneously, and an ion flight total distance is only about 12 cm. The miniature photodecomposition fragment translational velocity spectrometer of the present invention adopts the low-voltage weak field, so that a short shaft of an ion swing ball of a stationary state can reach the larger time difference, thereby being very conducive to a subsequent time slice operation. The miniature photodecomposition fragment translational velocity spectrometer of the application has the better performances, such as the resolution, etc., than the currently universal majority of ion imaging type photodecomposition fragment translational energy spectrometers of strong electric field (100-350 V / cm) acceleration and long-distance (38-105 cm) flight, and can provide the more accurate, simpler, more convenient and efficient experiment means for the photodecomposition dynamics research.

Description

technical field [0001] The invention relates to a low-voltage weak-field accelerated ion imaging type small-scale translational velocity spectrometer for photolytic fragments, and relates to the technical field of molecular reaction dynamics. Background technique [0002] Molecular reaction dynamics studies the molecular dynamic structure, reaction process, reaction rate and reaction mechanism in chemical reactions at the atomic and molecular levels. Accurately measuring the distribution of product molecular velocity in three-dimensional space (velocity distribution and angular distribution) is an important research content of molecular reaction dynamics, which can reveal the reaction channel, energy distribution, product quantum state distribution and reaction transition state of molecular chemical reactions, etc. information for in-depth understanding of reaction mechanisms and regulation of chemical reactions. Professor Li Yuanzhe won the Nobel Prize in Chemistry for usi...

AI Technical Summary

Problems solved by technology

Many ion imaging PTSs that have been built claim that the velocity resolution can reach Δv / v≈1%, but from the experimental results reported in the literature, only a few experimental spectra can reach this index

For instruments that measure speed, a strong applied electric field will adversely affect the accuracy of the measurement

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