Double-reflection type flight time mass spectrometric photoelectron velocity imaging instrument

Abstract

The invention provides a double-reflection type flight time mass spectrometric photoelectron velocity imaging instrument. The double-reflection type flight time mass spectrometric photoelectron velocity imaging instrument is provided with a laser sputtering ion source, a cooling ion trap, a flight time mass spectrum and a negative ion photoelectron velocity imaging system; the laser sputtering ionsource is used for generating cluster ions, after entering the cooling ion trap for imprisonment and cooling, and the generated cluster ions are accelerated vertically by an accelerating field and then enter the flight time mass spectrum. The negative ion photoelectron velocity imaging system is used for detecting emitted photoelectrons, and a photoelectron spectroscopy with a neutral cluster electronic structure is obtained. The laser sputtering ion source is used for generating cluster ions, after entering the linear ion trap for imprisonment and cooling, the generated cluster ions are accelerated vertically by an accelerating field and then enter the flight time mass spectrum, and the intensity distribution of the generated cluster ions is obtained through mass spectrometric detection.After the mass spectrum is analyzed, specific cluster negative ions are selected, and through the interaction with desorption laser, neutral molecules and the photoelectrons are generated. The negative ion photoelectron velocity imaging system is used for detecting the emitted photoelectrons, and the photoelectron spectroscopy with the neutral cluster electronic structure is obtained.

Description

technical field [0001] The invention relates to an imager, in particular to a double-reflection time-of-flight mass spectrum photoelectron velocity imager. Background technique [0002] Molecular Reaction Dynamics is the frontier field of chemical basic theory research. It applies the advanced analytical methods of modern physical chemistry to study the occurrence conditions, various reaction channels and microscopic reaction mechanisms of chemical reactions in different states and molecular systems at the atomic and molecular levels. The basis for controlling chemical reactions. Characterizing the geometric structure, energy level structure, and chemical reactivity of gas-phase ions / clusters is one of the most active research directions in molecular reaction dynamics. These studies involve the most fundamental issues such as the nature of chemical bonding, chemical reactions, and energy redistribution within reaction systems. From infrared to ultraviolet, spectroscopic m...

AI Technical Summary

Problems solved by technology

[0005] In order to obtain high-resolution mass spectra, the existing time-of-flight mass spectrometry-photoelectron velocity imager at home and abroad has a long field-free flight region and many lens groups, which leads to serious loss of ions reaching the photodesorption region and reduces the sensitivity of photoelectron velocity imaging. , for some ions that are difficult to produce or have short lifetimes, its energy spectrum detection is difficult

Images