Dynamic in-situ gas phase reaction tank for soft X-ray spectroscopy experiment

Abstract

The invention provides a dynamic in-situ gas-phase reaction tank for a soft X-ray spectroscopy experiment. The dynamic in-situ gas-phase reaction tank comprises a reaction tank main body, a reaction tank supporting piece and an external connecting piece. The reaction tank main body is provided with a sample cavity for placing a sample and a first light through hole communicated with the sample cavity, and a metal partition plate is arranged in the sample cavity. The reaction tank supporting piece comprises a supporting pipe, and the supporting pipe is connected with the reaction tank main body. The external connecting piece comprises a connector, a differential pumping pipeline, an electronic yield signal line and a bias line, and one end of the bias line sequentially penetrates through the differential pumping pipeline, the connector, the supporting pipe and the reaction tank main body to be connected with the metal partition plate. According to the invention, a bias voltage is applied to the metal partition plate, so that an electric field is generated between the sample and the metal partition plate, ionized gas particles are pulled away from the surface of the sample, background noise is reduced, and collection of electron yield signals becomes possible; and the reasonable Reynolds coefficient is achieved by reducing the distance between the window and the sample and adjusting the gas flow rate, and therefore it is guaranteed that the gas updating speed on the surface of the material is high.

Description

technical field [0001] The invention relates to the technical field of in-situ experiments, in particular to a dynamic in-situ gas phase reaction cell which can be used in soft X-ray spectroscopy experiments. Background technique [0002] In the field of scientific research, in-situ experiment refers to an experimental method that simulates the real environment and tracks and observes the changes in the structure and properties of the experimental object while scientific phenomena occur. The core component of the in-situ experiment is called the in-situ reaction cell, and its main function is to carry samples and simulate reaction conditions. [0003] Soft X-ray spectroscopy is a powerful tool for studying the electronic structure changes of materials. Here, the energy range of soft X-rays is defined as 100-2000eV, including the detection of K-edge absorption edges of light elements and L-edge absorption edges of transition metal elements. The required energy, the X-rays in...

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Problems solved by technology

There are three main problems existing in the existing in-situ reaction cell: First, the design of the in-situ reaction cell usually does not consider the collection of electron yield signals, but generally collects optical signals, which greatly reduces the requirements for the structural design of the reaction cell; However, compared with optical signals, electronic signals are more sensitive on the surface. Therefore, the collection of electronic signals is very important for the study of catalysis, sensors and other systems that mainly react at the interface between gases and materials. Traditional reaction cells cannot effectively collect electronic signals at the interface; The second is that the design of the general reaction cell does not consider the influence of conductance and other factors on the studied system, but due to the importance of the interface reaction, we need to keep the gas flowing quickly at the interface, so that the product gas quickly moves away from the interface and the biogas quickly It is close to the material interface, so the design of the traditional gas passage cannot meet the observation requirements of this type of system, and a more reasonable design of the mechanical structure of the reaction cell is required; third, the existing in-situ reaction cells usually use polyimide membranes, aluminum oxide, silicon oxide Such materials as the observation window, this reaction cell can be suitable for in-situ experiments using infrared, visible light and hard X-rays as light sources for observation, but because the penetration depth of soft X-rays in these materials is small, when using these materials It is impossible to effectively obtain information on the change of substances in the reaction pool

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