Results 41 to 50 of about 484,111 (194)

Imaging ultra thin layers with helium ion microscopy: Utilizing the channeling contrast mechanism [PDF]

, 2012
Background: Helium ion microscopy is a new high-performance alternative to classical scanning electron microscopy. It provides superior resolution and high surface sensitivity by using secondary electrons.\ud \ud Results: We report on a new contrast ...
Gastel, R. van, George, A., Hlawacek, G., Lorbek, S., Mocking, T.F., Poelsema, B., Veligura, V., Zandvliet, H.J.W.   +7 more
core   +3 more sources

Secondary Electron Yield Curve for Liquid Water

Microscopy and Microanalysis, 1999
Abstract We have measured the secondary electron yield curve for liquid water using an Environmental SEM. The secondary electron emission coefficient, measured as a function of incident electron energy, is important for interpreting contrast in hydrated biological and inorganic specimens.
BL Thiel, DJ Stokes, D Phifer
openaire   +1 more source

Energy-resolved secondary-electron emission of candidate beam screen materials for electron cloud mitigation at the Large Hadron Collider

Physical Review Accelerators and Beams, 2020
Energy-resolved secondary electron spectroscopy has been performed on air-exposed standard Cu samples and modified Cu surfaces that are tested and possibly applied to efficiently suppress electron cloud formation in the high-luminosity upgrade of the ...
S. Schulte, G. Hartung, J. Kröger, M. Himmerlich, V. Petit, M. Taborelli   +5 more
doaj   +1 more source

Catalytic Oxidative Cleavage of C(OH)-C Bonds in Lignin Model Compounds to Carboxylic Acids by Fe(NO3)3.9H2O/NaI/DMSO

Frontiers in Chemistry, 2022
The secondary C(OH)-C bonds are abundant in biomass such as lignin and cellulose. Thus, selective cleavage of the C(OH)-C bonds into value chemicals attracted much attention.
Xuerong Wang, Xuerong Wang, Huilin Sun, Caicui Li, Shuijiao Niu, Yu Gao, Ying Chen, Tianwei Xu, Tianwei Xu, Jinhui Wang, Jinhui Wang, Huanjun Xu, Huanjun Xu   +12 more
doaj   +1 more source

Analytical model for secondary electron yield of composite layered structures

AIP Advances
An analytical model is developed to calculate the secondary electron yield (SEY) of composite layered structures, based on two independent physical parameters of secondary electron emission.
Xue-Man Wan, Jing Yang, Tian-Cun Hu, Guo-Bao Feng, Na Zhang, Zhao-Lun Yang, Yun He, Wan-Zhao Cui   +7 more
doaj   +1 more source

Calculations of secondary electron yield of graphene coated copper for vacuum electronic applications

AIP Advances, 2018
The suppression of secondary electron yield (SEY) which can possibly lead to multipactor is an important goal for several applications. Though some techniques have focused on geometric modifications to lower the SEY, the use of graphene coatings as thin ...
H. K. A. Nguyen, J. Mankowski, J. C. Dickens, A. A. Neuber, R. P. Joshi   +4 more
doaj   +1 more source

Suppression of Secondary Electron Emission from Nickel Surface by Graphene Composites Based on First-Principles Method

Nanomaterials, 2023
Secondary electron emission (SEE) is a fundamental phenomenon of particle/surface interaction, and the multipactor effect induced by SEE can result in disastrous impacts on the performance of microwave devices. To suppress the SEE-induced multipactor, an
Min Peng, Chang Nan, Dawei Wang, Meng Cao, Liang Zhang, Laijun Liu, Chunliang Liu, Dangqi Fang, Yiqi Zhang, Yonggui Zhai, Yongdong Li   +10 more
doaj   +1 more source

Light Dark Matter Detection Prospects at Neutrino Experiments [PDF]

, 2009
We consider the prospects for the detection of relatively light dark matter through direct annihilation to neutrinos. We specifically focus on the detection possibilities of water Cherenkov and liquid scintillator neutrino detection devices.
Jason Kumar, John G. Learned, K. Griest, R. Bernabei, S. Pakvasa, Stefanie Smith, Y. G. Kim   +6 more
core   +1 more source

Novel types of anti-ecloud surfaces

, 2013
In high power RF devices for space, secondary electron emission appears as the main parameter governing the multipactor effect and as well as the e-cloud in large accelerators.
Aguilera, L., Caspers, F., Dávila, M. E., Galán, L., González, L. A., Montero, I., Nistor, V., Pinto, P. Costa, Raboso, D., Taborelli, M., Ulrich, U., Wolk, D.   +11 more
core   +1 more source

Research on the Withstand Voltage Properties of Cr/Mn-Doped Al₂O₃ Ceramics in Vacuum

Electronic Materials
Al2O3 ceramics are widely used in vacuum electronic devices. However, surface flashover in a vacuum during the application of high voltage significantly influences their reliability and restricts the development of vacuum electronic devices.
Dandan Feng, Xiaojing Wang, Xueying Han, Zhiqiang Yu, Jialun Feng, Hefei Wang   +5 more
doaj   +1 more source