Frequency Modulation Field Excitation Of Rydberg Atoms With A State Of Captivity,

In this thesis, a time-dependent multilevel approach(TDMA) for solving the time-dependent Schr?dinger equation for alkali atoms in static electronic field and an arbitrary time-dependent external field is presented. In this method, firstly, a kind of potential model wave functions of the alkali atom in zero field is chosen as a basis set to expand the wave function of the atom in static electronic field. Secondly, the time-dependent wave function of the atom in static electronic field and time dependent external field is expanded by the wave functions of the atom in static electronic field. The state-to-state transition probability can be obtained by solving a set of one order differential equations of the expansion coefficients.We have, for the first time, calculated the transition probability between two Rydberg Stark states of potassium atom in a static electronic field plus a microwave field and a radio-frequency(rf) field. The calculation results show that the populations between the two states are Rabi oscillation in the absence of the rf field, square-wave oscillations in the presence of the slow rf field, and stair steps oscillations in the presence of the intermediate rf field. We have also calculated rf multiphoton resonances in the presence of the high rf field , and the phase...