A method for studying the products after ion photoexcitation

Abstract

The invention relates to the photoelectron and molecule reaction dynamics field, and provides an ion optical excitation afterproduct researching method comprising the following steps: enabling ions toaccelerate and pass a flight time mass spectrum and a particle quality selector, and enter a magnetic shielding case; synchronizing ion fragments and laser pulses so as to form ion fragments; settinga focusing electrode group voltage as 0, applying voltage on a quality selection electrode group, and enabling the voltage on the electrodes to progressively increase according to the same gradient;applying a pulse electric filed on the focusing electrode group after the ion beam fragment passes the focusing electrode group; setting the voltage on the quality selection electrode group as 0 whenthe ions leave the quality selection electrode group, and enabling the ions and laser to mutually react so as to form ion fragments and photoelectrons; enabling the ion fragments to fly to the focusing electrode group and be reflected and to pass the quality selection electrode group and fly to an ion detector, enabling the ion beam and the laser to mutually react so as to emit formed photoelectrons, and using an extract electrode and a bunching electrode to accelerate the photoelectrons so as to reach an electron detector; comparing the ion fragments with photoelectron information.

Description

technical field [0001] The invention relates to the field of optoelectronic imaging technology and molecular reaction dynamics, in particular to a method for researching products after ion photoexcitation, which can simultaneously perform imaging of electrons and ion fragments, and has the ability to detect instantaneously emitted electrons and delayed emitted electrons. method. Background technique [0002] Particle velocity imaging technology is an important method for the study of molecular reaction dynamics. Its most important feature is that it can obtain the full three-dimensional velocity and direction distribution of scattering particles in one image at the same time, that is, it can simultaneously obtain the energy spectrum of particles. information and angular distribution information. Particle velocity imaging techniques can be applied in simultaneous measurements of photodissociation, where photodissociation of electrons in steady-state molecular anions produces...

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Problems solved by technology

[0003] In some polyatomic anion systems, according to the non-adiabatic coupling, the electron energy obtained by photoexcitation is distributed according to its vibration degree of freedom; when the vibration energy is reconverted into electron energy, the electron is emitted from the system. This process is relatively The process of photoexcitation has a delay on the order of microseconds. However, the defect of the existing technology is that in most existing photoelectron spectroscopy experiments, only the experimental data related to the instant electron emission can be obtained, but the delay cannot be detected. When electrons are emitted and related information is obtained, the method for studying the products after ion photoexcitation can solve the problem

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