Molecular photoreaction testing apparatus

Abstract

The present invention relate to the field of spectrochemistry and discloses a molecular photoreaction testing apparatus. The apparatus includes a droplet ejector, vacuum chamber, ionizer, Deflector I,mass filter, detector I, deflector II, ion beam concentrator I, ion trap I, ion beam concentrator II, ion trap II, time-of-flight mass spectrometry, lens, optical shutter, optical parametric oscillator, oscilloscope and vacuum pump set, the ion trap II being capable of being charged with buffer gas pulses and capable of increasing the air pressure in the ion trap II in a short time; The liquid droplet ejector mainly comprises an ejector housing, a liquid storage tank, an electrode pan and a pulse generator. The liquid storage tank is in the shape of an open barrel and is located in the ejector housing. The electrode pan is in contact with the bottom of the liquid storage tank, and the electrode pan is connected with the pulse generator by a cable. The electrode pad is composed of a groupof electrode rings, each electrode ring is composed of a piezoelectric ceramic ring and two electrodes, the center of the electrode pad is symmetrically divided into eight regions, and the voltage ofthe electrodes applied to each region can be controlled independently.

Description

technical field [0001] The invention relates to the field of spectrochemistry, in particular to a molecular photoreaction testing device which uses optical parameter oscillation to dissociate ions with high-efficiency infrared light. Background technique [0002] Mass spectrometry is a common method for studying the mass characteristics of different molecules in materials. It is usually necessary to atomize the solution containing the sample to be tested into a vacuum environment, and use devices such as charge detectors to study the ion beam current of the molecules to be tested in the vacuum environment. Combining mass spectrometry with an adjustable infrared laser, it is possible to record the vibrational spectrum of mass-selected ions through wavelength-dependent infrared multiphoton dissociation spectroscopy. In the test experiment, it is necessary to detect changes in the charge-to-mass ratio of ions. Optical parametric oscillation is a coherent light source with tunab...

AI Technical Summary

Problems solved by technology

Defect 1 of the existing technology: the output of optical parametric oscillation is difficult to realize the multi-photon absorption process. For pulsed optical parametric oscillation, short pulses on the order of nanoseconds hinder the vibration redistribution process in the molecule, thereby limiting the photons that can be absorbed , and for the continuous band optical parametric oscillation, the relatively weak power limits the photon absorption rate. Due to the above limitations, the efficiency of infrared photodissociation of ions by optical parametric oscillation is low; prior art defect two: a certain Some samples have different chemical structures in different layers in the solution. In some experiments, only the components near the liquid surface in the sample solution need to be analyzed. The general spraying method will cause samples with different structures in the solution to mix, which will interfere with subsequent experiments; Defect 3 of the prior art: In some prior art, the vibration of the piezoelectric ceramic material is used to generate and eject the liquid droplets of the sample solution, and the direction is difficult to change. In some experiments, it is necessary to constantly adjust the position of the injector to achieve the change of liquid The purpose of the drop ejection direction, the operation is relatively cumbersome, and the fourth defect of the prior art: the voltage drive circuit of the ion trap of the prior art is easily affected by factors such as the fluctuation of the amplifier gain and the temperature drift, which causes the vibration frequency of the ions in the ion trap to fluctuate , which affects the accuracy of the experiment, the molecular photoreaction testing device can solve the problem

Images