Photodetachment Of H~-in Cavities

Quantum approach is applied to calculate the photodetachmentcross sections of H in two different environments: two parallelplates and a rectangular cavity. The cross sections display oscill-ations. There are two ways to calculate the photodetachment crosssections. One is the quantum-mechanical approach; the other is theclosed-orbit theory. Different method provides different physicalpicture. The closed-orbit theory gives a clear physical picture forthe oscillations in the cross sections. The quantum results confirmthe closed-orbit results. The photodetachment cross sections canbe calculated by using the quantum method in coordinate repre-sentation or momentum representation. Different representation indifferent system can make the calculation simpler. The paper isorganized as follows:In Chapter1, we introduced the related research background ofthe photodetachment of negative ion.In Chapter2, we introduced the general formula for the photode-tachment cross section. Then we described the quantum approach indifferent representation on the photodetachment of negative hydro-gen ion in crossed electric and magnetic fields, and a static electricfield. And then we introduced the closed-orbit results of the negative hydrogen ion in two parallel plates.In Chapter3, we used quantum method to study the photodetach-ment of the negative hydrogen ion in two parallel plates and derivedthe formulas for the cross sections in different representationconsidering arbitrary laser polarization. Then we made a comparisonbetween the quantum results and closed-orbit results by changing thecorrelation coefficient of the two parallel plates. We found that thetwo results are excellent agreement with each other. We also foundthat the quantum results show small staircases in the case ofperpendicular polarization, which is contrary to the closed-orbitresults. It maybe due to the approximations used in both methods.In Chapter4, we used quantum method to calculate thephotodetachment cross sections of the negative hydrogen ion in arectangular cavity in different laser polarization. We also discussedthe photodetachment cross sections in a square cavity and arectangular cavity, and made a comparison with the cross section inthe absence of fields. The cross sections display oscillations. A briefdiscussion about the results was made by changing the size ofrectangular cavity.In Chapter5, we gave a short summary.