中国物理B ›› 1999, Vol. 8 ›› Issue (5): 383-388.doi: 10.1088/1004-423X/8/5/010

• • 上一篇    

SOLVATION DYNAMICS OF METHANOL INVESTIGATED BY FEMTOSECOND TIME-RESOLVED FLUORESCENCE UP-CONVERSION TECHNIQUE

张铁桥, 王树峰, 杨宏, 李建良, 龚旗煌   

  1. State Key Laboratory for Artificial Microstructure and Mesoscopic Physics, Department of Physics, Peking University, Beijing 100871, China
  • 收稿日期:1998-09-09 出版日期:1999-05-15 发布日期:1999-05-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 19525412 and 19884-001) and by the National Climbing Program in the "9th 5-Year Plan" and Youth Foundation for Laser Tec-hnology of High Technology Research and Development

SOLVATION DYNAMICS OF METHANOL INVESTIGATED BY FEMTOSECOND TIME-RESOLVED FLUORESCENCE UP-CONVERSION TECHNIQUE

Zhang Tie-qiao (张铁桥), Wang Shu-feng (王树峰), Yang Hong (杨宏), Li Jian-liang (李建良), Gong Qi-huang (龚旗煌)   

  1. State Key Laboratory for Artificial Microstructure and Mesoscopic Physics, Department of Physics, Peking University, Beijing 100871, China
  • Received:1998-09-09 Online:1999-05-15 Published:1999-05-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant Nos. 19525412 and 19884-001) and by the National Climbing Program in the "9th 5-Year Plan" and Youth Foundation for Laser Tec-hnology of High Technology Research and Development

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摘要： The solvation dynamics of methanol has been investigated using a femtosecond time-resolved fluorescence up-conversion technique. Transient fluorescence spectra of Coumarin 152A dissolved in methanol at different time were reconstructed from the measured fluorescence decays. The Stokes shift was obtained and the solvent response function Sv(t) was fitted using a bimodal function with a fast Gaussian component and a slow bi-exponential component. The Gaussian component was attributed to the effect of free streaming motion of the solvent molecules, whereas the bi-exponential component was caused by the rotational diffusion motion of the solvent molecules. A comparison of our results with reported data was made.

Abstract: The solvation dynamics of methanol has been investigated using a femtosecond time-resolved fluorescence up-conversion technique. Transient fluorescence spectra of Coumarin 152A dissolved in methanol at different time were reconstructed from the measured fluorescence decays. The Stokes shift was obtained and the solvent response function Sv(t) was fitted using a bimodal function with a fast Gaussian component and a slow bi-exponential component. The Gaussian component was attributed to the effect of free streaming motion of the solvent molecules, whereas the bi-exponential component was caused by the rotational diffusion motion of the solvent molecules. A comparison of our results with reported data was made.

中图分类号:  (Fluorescence and phosphorescence spectra)

  • 33.50.Dq
42.65.Re (Ultrafast processes; optical pulse generation and pulse compression) 33.20.Sn (Rotational analysis)