Novel double-reflection type flight time mass spectrum photoelectron velocity imager

Abstract

The invention relates to a novel double-reflection type flight time mass spectrum photoelectron velocity imager used for detecting an atom cluster or a molecule cluster. According to the system structure, the imager comprises a laser sputtering ion source, a flight time mass spectrum and a negative ion photoelectron imaging system. The laser sputtering ion source can be used for generating a cluster with a wide mass range. The flight time mass spectrum is used for rapidly detecting cluster ions in real time in an in-situ mode and can effectively observe and study formation and distribution rules of the cluster ions. The negative ion photoelectron velocity imaging system can be used for obtaining information such as vertical desorption energy of negative ions and an electron affinity of a neutral species. Compared with the prior art, the novel double-reflection type flight time mass spectrum photoelectron velocity imager has the advantages that the mass spectrum resolution and the energy spectrum resolution of a desorption area of the negative ion photoelectron velocity imaging system are high, and the imager can be used for detecting kinds of atom clusters or molecule clusters.

Description

technical field [0001] The invention belongs to the field of mass spectrometry and energy spectrum analysis, in particular to a novel double-reflection time-of-flight mass spectrometer photoelectron velocity imager. Background technique [0002] Atom or molecular clusters, usually referred to as clusters or microclusters, are microscopic or submicroscopic systems composed of several or even thousands of atoms, molecules or ions through physical or chemical bonding. Spatial dimensions generally range from a few angstroms to hundreds of angstroms. For this size, it is too small to be described by a solid, and too large to be described by an atom or a molecule, and its physical and chemical properties vary with the number of atoms contained. Therefore, many properties of clusters are not only different from single atoms or molecules, but also different from solids or liquids in the macroscopic sense. In many cases, people regard clusters as a new level between atoms, molecule...

AI Technical Summary

Problems solved by technology

Although the mass spectrometry studies of these gas-phase cluster ions provide a large number of thermodynamic properties and have achieved important results in determining the ion composition and reactivity, the pure mass spectrometry method cannot directly give the structural information and spectral data of the substance, and these data are It is an important basis for revealing the existence and nature of chemical species

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