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Study on photoacoustic phase spectrum of rare earth complex: Pr(HFA)3·2H2O

✍ Scribed by Mao Qinglu; Su Qingde; Zhao Guiwen

Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
450 KB
Volume
52
Category
Article
ISSN
1386-1425

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✦ Synopsis

The /,~-diketone rare earth complex: Pr(HFA)3.2HzO was synthesized and its amplitude and phase photoacoustic spectra in the range of 300-700 nm were reported. It was observed that the phase angle depends variously on the relaxation time ~ and the optical absorption coefficient ~ with the incident light wavelength 2. A model of a homogeneous powder sample containing multiple optical absorption bands based on the Mandelis work was introduced to interpret the phase spectrum. It is shown that this model is very suitable for explaining the phase data associated with the ~z ~r* transition and./~-f transitions of the title complex. The phase angle ~, is mainly related to r for the ~r ~r* transition while it is determined by fl for the f_)c transition at relatively low chopping frequencies. Furthermore, the dependence of amplitude and phase information on the chopping frequency was also investigated.

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