用正弦形和三角形刻线测量高斯激光光束直径

分析了用正弦形和三角形刻线测量高斯激光光束直径的问题。考虑到了对比度和周期数的影响,发现这两种刻线对于测量直径极小的高斯光束比朗琴刻线更可靠。

A Monte Carlo Simulation of a Monomer Dimer CO-O2 Catalytic Reaction on the Surface and Subsurface of a Face-centered Cubic Lattice

The presence of oxygen in the subsurface in monomer-dimer reactions(CO-O_(2)and NO-CO)is observed experimentally.The effect of subsurface oxygen on a CO-O_(2)catalytic reaction on a face-centered cubic(FCC)lattice is studied using Monte Carlo simulation.The effect of adding subsurface neighbours on the phase diagram is also extensively explored.It is observed that the subsurface oxygen totally eliminates the typical second order phase transition.It is also shown that the introduction of the diffusion of O atoms and the subsurface of the FCC lattice shifts the single transition point towards the stoichiometric ratio.