The importance of the virtual excitation in calculating the differential cross section of the elastic is discussed.
发现在弹性散射中虚激发的贡献是重要的。
It is shown hat the process of virtual photons shortens the lifetime of atom in excitation state, and remits in drift of energy levels of the ground state of atom.
结果表明，虚光子过程使原子处在激发态的寿命缩短，并导致原子的基态能漂移。
The virtual signal generator has 12-channels outputs for linear scanning frequency signal or fixed frequency sine wave excitation signal.
该发生器可以输出相位差可调的12通道线性扫频正弦激励信号或者输出12通道定频正弦激励信号。
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