Calculation of Multiphoton Transition in Li Atoms via Chirped Microwave Pulse

• 来源期刊: 中国物理快报（英文版）
• 年，卷（期）: 2011,（10）
• 页码范围: 70-73
• 页数: 4页
• 语种: 英文
• DOI: 10.1088/0256-307X/28/10/103201

摘要

The position and width of avoided crossings of Li atom energy levels in a static electric field is presented by using the B-spline basis set method combined with the model potential.Using the time-dependent multilevel approach,the population of Li atoms is transferred to the target state completely by one-photon,two-photon or a single multiphoton adiabatic rapid passage,which requires only a small frequency sweep.The calculation results agree well with the experiment and novel explanations are given to understand the experimental results.It is well known that adiabatic rapid passage (ARP) works perfectly in the population transfer of an atomic system.[1-3] Coherent population transfer via ARP in atoms through one-photon[2] or twophoton[4] transitions using chirped pulses has been demonstrated.If the frequency of an external field is swept through the resonance at a rate lower than the square of the Rabi frequency,the population can be transferred through many levels by sequential ARPs with approximately 100％ efficiency.