科研之友
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摘要
Far-ultraviolet (FUV, <200 nm) absorption spectroscopy provides molecular information about the electronic ground state and the excited state. Because photon energy of FUV light corresponds to various kinds of valence electronic transitions including sigma, n, and pi electron excitation and charge transfer (CT), almost all chemical compounds show characteristic FUV spectra. However, FUV spectral measurements of liquid samples are highly challenging, because the absorptivity of most liquids is very intense. We have developed an attenuated total reflection FUV spectrophotometer in order to measure the FUV spectra of liquid water and aqueous solutions. This paper introduces the FUV spectra (140-300 nm) of various aqueous solutions to describe (1) how the first electronic transition (<(A)over tilde> <- (X) over tilde )bands of water molecules in Group I, II, XIII, and lanthanoid (Ln(3+)) electrolyte solutions are associated with the hydration states of those metal cations, (2) how the protonation states of amino acids in aqueous solutions affect the electronic transition of the amino acids, and (3) the analysis of O-3 photolytic reaction in aqueous solution using a nano-sec pump-probe transient FUV spectrophotometer.
- 出版日期2015-3
