利用Wigner-Weisskopf近似研究了光致离化系统中的暗态效应。在双模量子化光场的驱动下,三个束缚态形成一个暗态。即使在t→∞的条件下,原子在该暗态上也能保持一定的占居数。还给出了光子数对原子在束缚态上的占居数的影响。

Using the Wigner Weisskopf approximation, the dark state effect in a Raman type photoionization system is studied. Driven by two quantum fields, a dark state is formed from three discrete states of the system, which does bot decay to the contunuum for a long period. The effect of photon number on the poulation trapping is discussed.