这两个光子接著会激发另两个原子放出光子而产生四个光子。
These two photons in turn could stimulate two other atoms to emit photons, yielding four photons.
本文报道用双色三光子共振电离法测量钐原子高激发态78个新能级。
The paper reports the measurement of 78 high-lying levels in samarium atoms by two-colour three-photon resonant ionization.
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。
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.
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