| 1. | Forbidden transitions are those for which dipole radiative transitions are not allowed by the selection rules .
禁戒跃迁指的是选择定则所不容许的偶极辐射跃迁。 |
| 2. | It is clearly important for us to know what these selection rules are and how they arise .
对于我们来说，知道这些选择定则的内容以及它们的产生根源，显然是很重要的。 |
| 3. | Frequently the absolute intensity is increased since the selection rules are less strict in the condensed phase .
由于在凝相中，选择定则是比较不严格的，所以绝对强度往往有所增大。 |
| 4. | A simplified form of
周环选择定则的一种简易形式 |
| 5. | So the selection rule of no is analogous to that of alkali atom and different from the usual diatom molecule . the conclusion is further affirmed by the two photon fl uorescence excitation spectrum of no
为此我们利用双光子荧光激发光谱技术对no分子所表现出的与普通双原子分子不同的跃迁选择定则进行了实验验证。 |
| 6. | In chapter two , the basic principles of rempi technique are introduced including the resonance enhanced effect , the selection rule , the mechanism of photoionization and photodissociation , rempi rate equation and the property of rydberg state
第二章介绍了rempi技术的基本原理，包括多光子共振跃迁的选择定则、电子态的光解离机理、描述rempi过程的速率方程和分子rydberg态的性质。 |
| 7. | According to the dipole transition selection rule , it allows the system to transit from the ground state to the first and second sub - band respectively , the shape of the photoionization cross - section varying with the photon energy in the two cases is quite different
根据偶极跃迁的选择定则，将使得体系从基态分别跃迁到电子的第一子带和第二子带，二者的光电离截面随光子能量的变化截然不同。 |
| 8. | The relationship between ion signal and laser intensity supports above conclusion also . at the same time , the optimum pressure is determined from the ion signal versus pressure . based on the experiment , the molecule constants about no resonant intermediate states are calculated
在此基础上，对于no分子在2 + 2和4 + 1离化过程中所表现出的不同于普通双原子分子的跃迁选择定则进行了较为细致的分析讨论。 |
| 9. | We consider two situations : ( i ) the light is polarized along the z - direction , in which case the first allowed dipole transition is to the first subband ( nx - 1 , ny = 1 ) ; ( ii ) the light is polarized along the x - direction ( paralleled to the transverse cross - section of the wire ) . the first allowed dipole transition is to the second subband nx = 2 relative to the x - direction and to the first subband nr = 1 relative to the y - direction of the wire
考虑了两种不同惰况：辐射光沿阶线的轴线偏振k方向x辐射光平行于轴截面偏振（设为二方向山偶极跃迁的选择定则使得体系从初态跃迁到末态分别为电于的第一于带和第二子带，二名的光电离0截面随光于能量的变化截然不同 |
| 10. | In chapter four the effects of a static electric field and different initial states on hhg are studied . under an additional electric field the spectrum exhibits a double - plateau structure . furthermore , the ionization probability and hhg also behave differently when the hydrogen atom is in different initial states
在第四章中，我们研究了外加平行静电场以及初态的不同对电离率和高次谐波的影响，发现附加一适当的静电场会使谐波曲线呈现一双平台结构，电离率会随着电场强度的增大而增大；当氢原子在初始时刻处于不同态时，根据选择定则，谐波曲线和电离率都会有较大差别。 |
