Data for: STIRAP simulations from the 1S to the 2S states for Hydrogen/Antihydrogen atoms

<p>This data is for a paper where we address the issue of achieving a high population of antihydrogen/hydrogen atoms in the 2S level which is essential for spectroscopy measurements testing similarities between matter and antimatter. We proposed and examined the efficiency of applying the STIRAP (Stimulated Raman Adiabatic Passage) process in achieving high population transfer from the 1S to the 2S levels. We utilized a circularly polarized Lyman alpha, Ly-α, pulse to couple the 1S state to the 2P state and a microwave pulse to couple the 2P state and the 2S state. We calculated the efficiency of the STIRAP process for transferring the population between the stretched states (1Sd, 2Sd) as a function of experimental parameters such as Rabi frequencies and pulse durations. We found that a Ly-α pulse with an energy of a few nanojoules could produce nearly perfect transfer at zero detunings for atoms on the laser beam axis. We extended the analysis to a thermal ensemble of atoms, where Doppler detuning affects the velocity distribution of the hydrogen atoms produced in the 2S level. We found that the width of such velocity distribution is controlled by the Rabi frequency. We showed that the peak velocity of the hydrogen atoms in the 2S level after STIRAP can be controlled by the Ly-α pulse detuning. The efficiency of STIRAP in transferring population increases at low temperature (T∼1 mK). Finally, we showed that a background magnetic field improves the transfer rates between the other trappable states (1Sc, 2Sc).</p>