[in Chinese], [in Chinese], [in Chinese]. Dark State Effect in a Raman-Type Photoionization System[J]. Acta Optica Sinica, 1998, 18(2): 129
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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.