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首页> 外文期刊>The Journal of Chemical Physics >Picosecond polarized fluorescence studies of anisotropic fluid media. II. Experimental studies of molecular order and motion in jet aligned rhodamine 6G and resorufin solutions
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Picosecond polarized fluorescence studies of anisotropic fluid media. II. Experimental studies of molecular order and motion in jet aligned rhodamine 6G and resorufin solutions

机译：各向异性流体介质的皮秒偏振荧光研究。二。喷射对准罗丹明6G和试卤灵溶液中分子有序和运动的实验研究

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New polarized time resolved fluorescence techniques are implemented to determine the full angular motion of a probe molecule in an anisotropic environment. Studies of rhodamine 6G and resorufin molecules aligned in a free ethylene glycol jet show that the presence of net molecular order is accompanied by a distinct anisotropy in alignment relaxation following photoselection. Diffusion coefficients for phi and theta motion (D-parallel to and D-perpendicular to) in a jet fixed axis system are determined from the cylindrically symmetric and asymmetric alignment relaxation rates for the isotropic and anisotropic regions of the jet. The presence of net negative molecular alignment as the free jet is formed is seen to correspond to restricted phi motion (D-parallel to < D-perpendicular to), with a net positive steady state alignment the anisotropy in the diffusion dynamics is reversed. The differences in D-parallel to and D-perpendicular to are attributed to anisotropy in the solvent viscosity as a consequence of flow. The combination of linear and circular polarization techniques is seen to provide useful information on cylindrical asymmetry and relaxation dynamics hitherto unobserved by conventional fluorescence polarization techniques. (C) 2000 American Institute of Physics. [S0021-9606(00)00217-8]. [References: 35]
机译：实施了新的极化时间分辨荧光技术，以确定各向异性环境中探针分子的完整角运动。在自由乙二醇射流中比对的若丹明6G和试卤灵分子的研究表明，净分子有序伴随着光选择后比对弛豫的明显各向异性。喷头固定轴系统中phi和θ运动（D平行于D且垂直于D垂直）的扩散系数由喷头各向同性和各向异性区域的圆柱对称和非对称对准弛豫率确定。观察到形成自由射流时净负分子排列的存在对应于受限制的phi运动（D平行于

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