Differential multiphoton absorption by chiral molecules and the effect of permanent moments
Differential multiphoton absorption by chiral molecules and the effect of permanent moments
复制标题
手性分子的差分多光子吸收和永久矩的影响
DOI：
10.1088/0022-3700/20/9/011
复制
发表时间：
1987
期刊：
影响因子：
--
通讯作者：
E. A. Power
中科院分区：
文献类型：
--
作者：
W. J. Meath;E. A. Power
永久矩的分子没有反转中心或对称平面的影响被认为是，包括概括的圆二色性多光子过程中，在几种情况下。通过引入广义爱因斯坦B系数，比较了n个左旋圆偏振光子和n个右旋圆偏振光子的吸收率。半经典理论和量子电动力学表明，在微扰理论，使平等的预测。被认为是在锁定位置相对于光束的几何形状和自由旋转的分子的手性吸收剂的微分速率。除了跃迁矩之外，永久电偶极矩的存在允许在仅用跃迁矩不可能吸收的情况下发生多光子吸收。两个和三个光子的情况下，在一些详细的单光束。考虑了磁过渡矩和电四极矩的影响。
The effects of permanent moments for molecules with no centre of inversion or plane of symmetry are considered, including the generalisation of circular dichroism to multiphoton processes, in several circumstances. The absorption rate for n left-handed circularly polarised photons is compared with that for n right-hand circularly polarised photons by introducing generalised Einstein B coefficients. Semiclassical theory and quantum electrodynamics are shown, within perturbation theory, to make equal predictions. The differential rates are considered both for chiral absorbers in locked-in positions relative to the geometry of the beam and for freely rotating molecules. The presence of permanent electric dipole moments, in addition to transition moments, allows multiphoton absorption to take place in situations where absorption is not possible with transition moments only. The two- and three-photon cases are developed in some detail for a single light beam. The effects of both magnetic transition moments and electric quadrupole permanent and transition moments are considered.