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首页> 外文期刊>The Journal of Chemical Physics >PREPARATION AND PROBING OF ALIGNMENT IN MOLECULAR ENSEMBLES BY SATURATED COHERENT PULSED LASER EXCITATION
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PREPARATION AND PROBING OF ALIGNMENT IN MOLECULAR ENSEMBLES BY SATURATED COHERENT PULSED LASER EXCITATION

机译：饱和相干脉冲激光激发在分子团中的对准及制备

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摘要

An analytical solution of the optical Bloch equations for a degenerate two-level system is presented for coherent excitation with a monochromatic light pulse of rectangular time profile and linear polarization including off-resonance interaction. The generalization to an arbitrary excitation and detection geometry is achieved by incorporation of the appropriate coordinate frame rotations. In this way the formalism can be applied to the determination of alignment parameters in molecular ensembles even under partially saturated conditions. In the limit of linear absorption the results reduce to those obtained by Greene and Zare [J. Chem. Phys. 78, 6741 (1983)]. For complete saturation on lines of a Q or R branch, polarized fluorescence detection is sensitive only to the quadrupole alignment moment. The formalism also allows investigation of the production of aligned ensembles via coherent optical pumping with a single pulse. Depending on the degree of saturation as well as the detuning from resonance, strong alignment can be created. (C) 1996 American Institute of Physics. [References: 55]
机译：提出了简并两级系统的光学Bloch方程的解析解，用于相干激发具有矩形时间轮廓和线性极化（包括共振共振）的单色光脉冲。通过合并适当的坐标系旋转，可以实现对任意激发和检测几何的一般化。通过这种方式，即使在部分饱和的条件下，形式主义也可以应用于确定分子集合体中的比对参数。在线性吸收的极限下，结果减少到Greene和Zare所获得的结果[J。化学物理78，6741（1983）]。为了使Q或R分支的行完全饱和，偏振荧光检测仅对四极对准矩敏感。形式主义还允许通过单个脉冲的相干光泵浦来研究对准的合奏的产生。根据饱和度以及与共振的失谐，可以创建强对齐。 （C）1996年美国物理研究所。 [参考：55]

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