Review of Scientific Instruments最新文献_第3页

Development of soft x-ray absorption spectroscopy technique with simultaneous measurement in electron- and fluorescence-yield modes from high vacuum to ambient pressure for observation of surface adsorbed species. 开发软 X 射线吸收光谱技术，同时测量从高真空到环境压力下的电子和荧光产率模式，用于观察表面吸附物种。

IF 1.3 4区工程技术

Review of Scientific Instruments Pub Date : 2024-11-01 DOI: 10.1063/5.0225539

Kohei Shibuya, Kenta Amemiya

{"title":"Development of soft x-ray absorption spectroscopy technique with simultaneous measurement in electron- and fluorescence-yield modes from high vacuum to ambient pressure for observation of surface adsorbed species.","authors":"Kohei Shibuya, Kenta Amemiya","doi":"10.1063/5.0225539","DOIUrl":"https://doi.org/10.1063/5.0225539","url":null,"abstract":"To understand the reactions of heterogeneous catalysts at the solid-gas interface under actual reaction conditions, it is important to develop a method to observe the surface-adsorbed species during the reaction, including the changes before and after the adsorption of light elements involved in the surface reaction. We developed a soft x-ray absorption spectroscopy (XAS) technique that allows simultaneous measurements in the electron- and fluorescence-yield modes in the pressure range of 10-4-1 × 105 Pa. In the developed system, the reaction gas near the sample surface is separated from the beamline vacuum by a Si3N4 window and confined to a small area to suppress x-ray absorption by the gas. The electron-yield spectra were obtained by measuring the sample current while applying a bias potential to the Si3N4 window. XAS measurements were performed from high vacuum to ambient pressure by setting the bias potential to 600 and 39 V below and above 100 Pa, respectively. An anatase TiO2 nanoparticle-deposited film was prepared by spin coating, and soft XAS was performed to observe the photocatalytic oxidative decomposition reactions of isopropanol in the presence of water and oxygen. The obtained O K-edge spectra showed that it is possible to observe adsorbed oxygen on solid oxides even under ambient pressure conditions containing 0.1% of oxygen gas.","PeriodicalId":21111,"journal":{"name":"Review of Scientific Instruments","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142626931","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Thermal helium beam diagnostic for 2D profile measurements in the divertor of ASDEX Upgrade. 用于 ASDEX 升级版分流器二维剖面测量的热氦束诊断。

IF 1.3 4区工程技术

Review of Scientific Instruments Pub Date : 2024-11-01 DOI: 10.1063/5.0237317

S Hörmann, M Cavedon, M Griener, D Wendler, R Dux, K Schmid, A Kappatou, M Wischmeier, D J Cruz-Zabala, E Viezzer, U Stroth

{"title":"Thermal helium beam diagnostic for 2D profile measurements in the divertor of ASDEX Upgrade.","authors":"S Hörmann, M Cavedon, M Griener, D Wendler, R Dux, K Schmid, A Kappatou, M Wischmeier, D J Cruz-Zabala, E Viezzer, U Stroth","doi":"10.1063/5.0237317","DOIUrl":"https://doi.org/10.1063/5.0237317","url":null,"abstract":"A new thermal helium beam diagnostic has been implemented in the outer lower divertor of the ASDEX Upgrade tokamak. The purpose of this diagnostic is to measure two-dimensional profiles of electron density (ne) and temperature (Te) with high temporal and spatial resolution. The geometry of the lines of sight is chosen to avoid the influence of prompt recycling and to optimize the resolution without significantly impacting the divertor structure. Moreover, the effect of long-term helium recycling has been analyzed, and its amplitude compared to the active signal is negligible. Finally, the reconstruction of ne and Te is done via a collisional radiative model, while a static and a dynamic model were implemented and compared with SOLPS simulations as well as divertor Thomson scattering data. Furthermore, a new 2D parameterization of the outer divertor volume, which is required for the dynamic model, was developed. Due to its fast and local ne and Te profile measurements, the diagnostic is suitable for investigating fast processes such as divertor transitions and filaments.","PeriodicalId":21111,"journal":{"name":"Review of Scientific Instruments","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142626969","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Design of an atomic layer deposition system with in situ reflection high energy electron diffraction. 利用原位反射高能电子衍射设计原子层沉积系统。

IF 1.3 4区工程技术

Review of Scientific Instruments Pub Date : 2024-11-01 DOI: 10.1063/5.0206286

Alexandra J Howzen, Justin Caspar, Alparslan Oztekin, Nicholas C Strandwitz

{"title":"Design of an atomic layer deposition system with in situ reflection high energy electron diffraction.","authors":"Alexandra J Howzen, Justin Caspar, Alparslan Oztekin, Nicholas C Strandwitz","doi":"10.1063/5.0206286","DOIUrl":"https://doi.org/10.1063/5.0206286","url":null,"abstract":"We report the design, fabrication, and testing of an atomic layer deposition (ALD) system that is capable of reflection high energy electron diffraction (RHEED) in a single chamber. The details and specifications of the system are described and include capabilities of RHEED at varied accelerating voltages, sample rotation (azimuthal) control, sample height control, sample heating up to set temperatures of 1050 °C, and either single- or dual-differential pumping designs. Thermal and flow simulations were used to justify selected system dimensions as well as carrier gas/precursor mass flow rates. Temperature calibration was conducted to determine actual sample temperatures that are necessary for meaningful analysis of thermally induced transitions in ALD thin films. Several demonstrations of RHEED in the system are described. Calibration of the camera length was conducted using a gold thin film by analyzing RHEED images. Finally, RHEED conducted at a series of increasing temperatures was used to monitor the crystallization of an ALD HfO2 thin film. The crystallization temperature and the ring pattern were consistent with the monoclinic structure as determined by separate x-ray diffraction-based measurements.","PeriodicalId":21111,"journal":{"name":"Review of Scientific Instruments","volume":null,"pages":null},"PeriodicalIF":1.3,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142626795","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The infrared thermography system on the MAST-U tokamak. MAST-U 托卡马克上的红外热成像系统。

IF 1.3 4区工程技术

Review of Scientific Instruments Pub Date : 2024-11-01 DOI: 10.1063/5.0219544

J M Stobbs, A Tookey, A J Thornton, T Farley

引用次数: 0