极性染料溶液的微微秒动态荧光光谱移位

Picosecond study of time-dependent spectral shift in polar dye solutions

本文测量了染料分子DCM、甲酚紫、DODCI和DTDCI在极性溶剂中的微微秒时间分辨荧光光谱;作者将动态的光谱移位归结为由于溶质分子激发态与基态偶极矩的显著差异而引起的周围溶剂分子的介电弛豫;并从动态的光谱移位得到的弛豫时间很接近由连续腔体理论模型求得的计算值,表明连续胜体模型用于描述动态的光谱移位现象是适用的.

The picosecond time-resolved fluorescence spectra are measured for DCM, orysel violet, DODCI and DTDCI in polar solvents. The time-dependent spectral shifts (TDSS) are attributed to the dielectric ralaxation of the solvent surrounding the solute molecule, whose dipole moment undergoes pronounced change upon excitation-The relaxation times obtained from TDSS are in good agreement with those calculated from the continuum cavity model, indicating the applicability of the continuum cavity model for the description of TDSS.