Physical Characteristics In The Process Of Photodissociation And Photoionization

Quantum mechanics has achieved great achievements due to the explanations of chemical and other properties, however, the interactions between materials and light are still not assured. In 1929, a new theory of interactions between materials and light was generated, which made the interactions between materials and light become the focal point of the academia. The main points of this article are to discuss the polarization (orientation and alignment) of the fragments in the process of studying the interaction between materials and light and the ionization coherence in the ionization process. The polarization of angular momentum after the ionization for the different polarized lights (linearly polarized light, circular polarized light, unpolarized light) has been. studied under the axial-recoil limit. The interaction between light and materials can bring the interference of the ionization waves. The article also include that in terms of population of the ionization states, the phenomenon of ionization interference is studied by partial-wave expansion method. Considering the interaction between splitting levels in the fine structure, the results of numerical simulation of the population in the state of ionization is given by np pulses (n may be integer or half-integer).The first part: the polarization of the fragments has been studied when different polarized lights interact with materials under the axial-recoil limit. The coherent excitation between levels with different helicity quantum numbers has been carefully discussed. As we expected, vector correlation as a function of k has provided important information which are difficult to get in the scalar natures. We can directly discuss the excitation matrix and state multipoles in the process of photodissociation, calculate the differential cross section and polar span of angular momentum.The second part: the interference phenomenon of dissociation has been studied using the partial-wave expansion method through the population in the state of ionization. In this article, we proposed a new method to expand continuous wave into partial waves so as to find the interference on the state of ionization. Under the action of laser field, the coupling effect of the fine levels of the atom arised, and at the same time the interference between two channels of ionization occured. By changing the phase difference between the two ionization channels, the population of the ionization state are affected, so that the interaction between the two ionization channels can be studied.