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89 results on '"Xu, Pengshou"'

1. Influence of the photon beam position on incident SR intensity at SXMCD endstation

Author

Guo, Yuxian and Xu, Pengshou

Subjects
Physics - Accelerator Physics
Abstract

A small fluctuation of the photon beam position will affect the characteristics of the synchrotron radiation (SR) intensity and polarization when it enters the end-station through the related beamline. In this paper, by changing the electron orbit equilibrium position in the vertical direction, we have measured the corresponding changes in the absorption strength of the SR with a gold mesh in different chopper aperture positions. It is found that for three aperture positions, the absorption intensity of the gold mesh shows a good Gaussian distribution as the photon beam position moves, while the ratio of the SR intensity passing through the upper and lower apertures shows a monotonous variation. This suggests a new method for estimating the circular polarization degree of SR originating from the bending magnet based on our current measurement., Comment: 10 pages, 5 figures. received by Chinese Physics C

Published
2013
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47. The spin and orbital moment contributions of each element to macroscopic magnetization in Co0.9Fe0.1 films.

Author

Guo Yuxian, Wang Jie, Li Honghong, Xu Pengshou, and Cal Jianwang

Subjects
IRON-cobalt alloys, MAGNETIZATION, DICHROISM, MAGNETISM, ALLOYS, IRON, COBALT
Abstract

Co-Fe alloy films have such properties as high saturation magnetization, high Curie temperature and low coercive force. It is of importance to study the origin of high saturation magnetization in these alloys. In this paper, we study the spin (ms) and orbital moments (mo) of Fe and Co in the Co0.9Fe0.1 film by using X-ray magnetic circular dichroism (XMCD) and SQUID magnetometry. The ms and mo for Co are 1.58 and 0.31 µB, and for Fe are 1.63 and 0.36 µB respectively. The average magnetic moment (1.90 µB) determined by XMCD is in agreement with that obtained from SQUID measurements. The total magnetic moment ratio of Fe to Co is 10.5:89.5, while the ratio of the spin to orbital moment is 83.4:16.6. Considering the separation of the spin and orbital moment, an outcome of mFe-spin : mFe-orbit : mCo-spin mCo-orbit = 8.6:1.9:74.8:14.7 is obtained. [ABSTRACT FROM AUTHOR]

Published
2006
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49. High Photocatalytic Activity of Rutile TiO2Induced by Iodine Doping

Author

He, Jingfu, Liu, Qinghua, Sun, Zhihu, Yan, Wensheng, Zhang, Guobin, Qi, Zeming, Xu, Pengshou, Wu, Ziyu, and Wei, Shiqiang

Abstract

To improve the energy conversion of solar irradiation, a photocatalyst with high reactivity under visible light is required. Using density functional theory, the structural and electronic properties of iodine cation-doped rutile TiO2are studied. The total energy calculations show that iodine substituting for titanium sites in TiO2matrix is energetically favorable. The electronic structure calculations reveal that iodine doping induces a delocalized band consisting of I 5s states and O 2p states at the top of the valence band of TiO2. Due to this delocalized state, the band gap is markedly narrowed by about 0.4 eV, the optical absorption is extended to the visible light region, and the excited electron−hole pairs are expected to have better mobility. Moreover, the conduction band edge is raised above the reduction level of H2/H2O by I-doping, which enables the achievement of high photocatalytic efficiency of I-doped rutile TiO2.

Published
2010
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50. Alkali Rb-doped C[sub 60]: The movement of the valence band (abstract).

Author

Pan Haibin, Xu Pengshou, Lu Erdong, Yang Fengyuan, Xia Andong, Zhang Xinyi, and Zhang Guochang

Subjects
*PHOTOEMISSION, *SPECTRUM analysis, *MEASUREMENT
Abstract

Presents an abstract of a paper describing the measurement of the photoemission spectra of undoped C[sub 60] and alkali Rb-doped C[sub 60] to reveal their electron structure. Complex movement of the top of the valence band through the process of alkali Rb doping; Possible reason for the backward movement of the spectrum.

Published
1995
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