摘要
根据三能级系统三光子共振激发过程,建立了求解各能级布居数和电离效率的速率方程组,通过拉普拉斯变换方法,得到了在多光子激发电离过程中各能级布居率和电离效率的解析表达式,并运用该表达式研究了铯原子在典型实验条件下,基态6s(S1/2)相继吸收2个光子到达共振态6p(P3/2)、7d(D3/2)后再吸收一个光子电离的(1+1′+1′)过程中,各激发光强度以及激光脉冲宽度对各共振激发态布居率和电离效率的影响,并得到了各能级分别抽空时激发光强度必须满足的条件.
The rate-equation and the Laplace transformation were used to study the ＇three photons resonant ionization process of three- level system, and the analytical formulas of the resonant state populations and the ionization probabilities were obtained. By using this formulas to study the （ 1 ＋ 1′ ＋ 1′） resonant ionization process of Ca atom which are excited to the 6p（P3/2）,6d（D3/2） resonant state from the ground state 6s（81,-2） by the first two photons following the ionization by the third photon, the influence of the laser intensity and pulse width on the resonant state populations and ionization efficiency were investigated. The conditions of the laser intensity to evacuate the two resonant states population were also presented respectively.
出处
《安徽师范大学学报（自然科学版）》
CAS
2006年第5期444-448,共5页
Journal of Anhui Normal University(Natural Science)
基金
国家教育部科学技术重点项目(NO204065)
安徽省教育厅自然科学基金项目(2001KJ116ZD)
关键词
三能级系统
三光子共振电离
速率方程
电离效率
three-level system
three photon resonant ionization
rate equations
ionization efficiency
