高等学校化学学报

高等学校化学学报 ›› 2000, Vol. 21 ›› Issue (5): 698.

• 论文 • 上一篇    下一篇

固体样品的光声位相理论及应用研究

伍荣护, 宛寿康, 苏庆德   

  1. 中国科学技术大学化学系, 合肥 230026
  • 收稿日期:1999-05-05 出版日期:2000-05-24 发布日期:2000-05-24
  • 通讯作者: 苏庆德(1947年出生),男,博士,教授,博士生导师,主要从事光声光谱和稀土化学研究.
  • 基金资助:

    国家自然科学基金(批准号:29875026)

Studies on the Theory and Applications of the Photoacoustic Phase of Solid Sample

WU Rong-Hu, WAN Shou-Kang, SU Qing-De   

  1. Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
  • Received:1999-05-05 Online:2000-05-24 Published:2000-05-24

PDF (PC)

被引次数

7

摘要： 在R-G理论的基础上,考虑了无辐射弛豫过程对位相信号的影响,推导出新的位相公式。研究结果表明,位相(ψ)与吸收系数(β)、热扩散长(μs)、弛豫时的延迟时间(τ)和快弛豫与慢弛豫时的热量比(R)有关。并用此公式解释了稀土化合物PrF3和叶绿素b的位相谱。PrF3的位相由f-f跃迁的吸收系数决定,而叶绿素b两个吸收带之间的位相差是由快弛豫与慢弛豫时放出的热量比不同产生的。

关键词: 光声位相谱, 无辐射弛豫过程, 氟化镨, 叶绿素b

Abstract: Based on the R-Gtheory of the photoacoustic effect, a new formula on the PAphase was presented while the phase caused by non-radiative relaxation processes was considered. The phase is associated with the absorption coefficient(β), thermal diffusion length of sample(s), the delay time of relaxation(τ) and the ratio of the heat component(R) of rapid relaxation to that of slow one. The phase spectra of PrF3 and chlorophyll b were explained well by using of this formula. The phase of PrF3 is determined by the absorption coefficient for the f-f transition. The phase difference between the two bands of chlorophyll b is caused by the different heat component ratios of rapid relaxation to slow one.

Key words: Photoacoustic phase spectrum, Non-radiative relaxation processes, Praseodymium fluoride, Chlorophyll b

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