Scanning Tunneling Microscope Study on C2H2 Adsorption on a Ge(100) Surface

Geunseop Lee1, Kyeongseong Chae2
1Department of Physics, Inha University, Incheon 22212, Korea
2Department of Physics, Chonnam National University, Gwangju 61186, Korea

Figs. A. Schematic diagrams of the adsorption configurations proposed for C2H2 on Ge(001): di-$\sigma$-bonded in (a) on-top, (b) end-bridge, and (c) paired end-bridge configurations, and tetra-$\sigma$-bonded in (d) parallel-bridge and (e) rotated-bridge configurations. H atoms in a C2H2 molecule are not shown for simplicity. B. Empty-state STM image of C2H2/Ge(001) (Vs = +0.8 V) [Inset: filled-state (Vs = -2.0 V) image taken simultaneously over the same area]. The characteristic empty-state double maximum of the one-dimer (circle) and quadruple maximum of the two-dimer (square) features indicate C2H2 adsorption in on-top and paired end-bridge configurations, respectively.

J. Korean Phys. Soc. 2019; 75: 924-928

Head-on Collision Between Two Envelope Solitary Waves in a Granular Medium

Wen-Qing Du1, Jian-An Sun2Juan-Fang Han,Wen-Shan Duan2, Yang-Yang Yang3, Xin Jiang4
1Graduate School of China Academy of Engineering Physics, Beijing 100088, China
2College of Physics and Electronic Engineering and Joint Laboratory of Atomic and Molecular Physics of NWNU & IMP CAS,
Northwest Normal University, Lanzhou 730070, China
3Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730070, China
4Key Laboratory of Marine Materials and Protective Technologies, Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, Ningbo 315201, China

Head-on collisions between two envelope solitary waves were investigated. The interesting result is that no phase shift or phase delay is detected after the head-on collision between two envelope solitary waves. At the same time, for the investigated amplitudes of the two envelope solitary wave, we found that the maximum amplitude during their collision is less than the sum of their initial amplitudes, but greater than the amplitude of either envelope solitary wave before collision.

J. Korean Phys. Soc. 2019; 75: 903-908
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