物理化学学报 >> 1986, Vol. 2 >> Issue (05): 400-407.doi: 10.3866/PKU.WHXB19860503

研究论文 上一篇    下一篇

荧光素钠溶液的pH值对其激光及光谱特性的影响

陈文驹; 张桂兰; 徐晨   

  1. 南开大学物理系
  • 收稿日期:1985-08-16 修回日期:1985-11-11 发布日期:1986-10-15

EFFECT OF pH VALUE ON THE LASING AND SPECTRAL CHARACTERISTICS OF SODIUM FLUORESCEIN SOLUTION

Chen Wenju; Zhang Guilan; Xu Chen   

  1. Department of Physics; Nankai University
  • Received:1985-08-16 Revised:1985-11-11 Published:1986-10-15

摘要: 本文研究了荧光素钠乙醇溶液的pH值对其激光能量转换效率以及吸收光谱、荧光光谱等特性的影响。通过对其吸收光谱的研究, 证明荧光素钠在乙醇溶液中存在多种互变异构体。在不同pH值的溶液中, 它们具有不同的浓度而处于酸碱平衡。各种异构体对λ=337.1 nm激发光的吸收截面σ_P和其荧光最子产额φ各不相同。随着pH值的增大, 溶液中双价阴离子的浓度逐渐增大。而双价阴离子的σ_P和φ值为最大。由于激光输出能量的大小与σ_P和φ直接有关, 因此, 荧光素钠溶液的激光能量转换效率也将随着pH值的增大而提高。

Abstract: In this reaserch, we have studied the effect of pH value of sodium fluorescein in ethanol solution on its characteristics of laser energy conversion efficiency, absorption spectra and fluorescence spectra. By studying the absorption spectra, we have verified the existence of various tautomers of sodium fluorescein in ethanol solution. Each tautomer with different concentration is in acid-base equilibria in the solution at various pH values. The absorption cross section, σ_p, for λ=337.1 nm and fluorescence quantum yield, φ, of each tautomer are quite different. When pH value increases, the concentration of dianion, which has the largest value of σ_p and φ in all tautomers, gradually increases in the solution. So that, the laser energy conversion efficiency of sodium fluorescein solution will enhance, as its pH value increases due to the dependence of the laser output energy of dye solution on the value of σ_p and φ.