The multiple quantum process, in which n quanta of energy ω0/n are absorbed or emitted between a pair of adjacent levels spaced out by ω0, is called subharmonie resonance （SHR）. There is no real intermediate level...The multiple quantum process, in which n quanta of energy ω0/n are absorbed or emitted between a pair of adjacent levels spaced out by ω0, is called subharmonie resonance （SHR）. There is no real intermediate level between the level pair. The transition between the two levels is generally allowed and it is directly observable under the pulsed excitation. The excitation will be very inefficient since the irradiation frequency is far away from, the resonance, so to deal with it, a higher order perturbation is needed.展开更多
文摘The multiple quantum process, in which n quanta of energy ω0/n are absorbed or emitted between a pair of adjacent levels spaced out by ω0, is called subharmonie resonance （SHR）. There is no real intermediate level between the level pair. The transition between the two levels is generally allowed and it is directly observable under the pulsed excitation. The excitation will be very inefficient since the irradiation frequency is far away from, the resonance, so to deal with it, a higher order perturbation is needed.
