CAJ | 학술논문

采用波包动力学方法研究了HF分子基电子态的多光子跃迁.激光场由两束频率比为1:2的重合红外脉冲构成.态|0,0?作为初始态,态|4,0?与态|4,2?分别作为目标态.计算结果表明,通过选取不同的共振频率,可以控制布居跃迁至不同的目标态.两束脉冲间的初相位差可以控制布居转移概率.当初相位差为π/2的偶数倍时,布居转移概率为最大值.当初相位差为π/2的奇数倍时,布居转移概率为最小值.初相位差对于态|4,0?的布居影响大于态|4,2?.
채용파포동역학방법연구료HF분자기전자태적다광자약천.격광장유량속빈솔비위1:2적중합홍외맥충구성.태|0,0?작위초시태,태|4,0?여태|4,2?분별작위목표태.계산결과표명,통과선취불동적공진빈솔,가이공제포거약천지불동적목표태.량속맥충간적초상위차가이공제포거전이개솔.당초상위차위π/2적우수배시,포거전이개솔위최대치.당초상위차위π/2적기수배시,포거전이개솔위최소치.초상위차대우태|4,0?적포거영향대우태|4,2?.
The multiphoton transition is investigated theoretically by using wave packet method for the ground electronic state of HF molecule. A laser field composed of two overlapping infrared pulses is used in our model, and the ratio of their frequencies is 1:2. States|4,0?and|4,2?are chosen as target states. Calculated results show that the population can be transferred to different target states as the corresponding resonant frequency is chosen. The probability of the population transfer can be controlled by the initial phase difference of the two pulses. When the initial phase difference is of an odd number ofπ/2, the probability of population transfer reaches the maximal value. When the initial phase difference is of an even number ofπ/2, the probability of population transfer reaches the minimum value. In comparison with the state|4,2?, the initial phase difference has a stronger in fluence on the population of the state|4,0?.