Because here what we have is some atom that we're studying, in the case, it's going to be a gas, and we hit it with a photon that has some incident energy.
The first that we need to know the energy of the photon that's incident on our gaseous atom.
首先，我们需要知道，入射到气体原子的光子的能量。
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A simple and effective method - equivalent incident wave method of FDTD was presented and used for analysis of photon scanning tunneling microscopy (PSTM).