Direct observation of the absorption bands of the first electronic transition in liquid H2O and D2O by attenuated total reflectance far-UV spectroscopy.
Direct observation of the absorption bands of the first electronic transition in liquid H2O and D2O by attenuated total reflectance far-UV spectroscopy.
复制标题
通过衰减全反射远紫外光谱直接观察液态 H2O 和 D2O 中第一次电子跃迁的吸收带。
作者：
A. Ikehata;N. Higashi;Y. Ozaki
用独特设计的衰减全反射远紫外(ATR-FUV)光谱仪直接观测到水(H(2O)O)和重水(D(2O)O)在液态的第一电子跃迁(X(1)A(1)-->；A(1)B(1))的吸收带。由于ATR几何结构降低了吸光度，因此可以在整个X(1)A(1)-->；A(1)B(1)吸收带上获得FUV光谱，包括带最大值。系统地测量了H(2)O和D(2)O在10-70℃加热时的FUV光谱，并对Kramers-Kronig变换进行了分析，发现第一电子跃迁带在加热时红移。这一结果与在X(1)A(1)-->；A(1)B(1)吸收带的低能带尾部经常观察到的红移是一致的。
Absorption bands of the first electronic transition (X (1)A(1)-->A (1)B(1)) of water (H(2)O) and heavy water (D(2)O) in the liquid state have been directly observed by using a uniquely designed attenuated total reflectance far-ultraviolet (ATR-FUV) spectrometer. Since the ATR geometry reduces the absorbance, the FUV spectra can be obtained over the entire X (1)A(1)-->A (1)B(1) absorption band, including the band maxima. Systematic measurements of the FUV spectra of H(2)O and D(2)O with heating from 10 to 70 degrees C and the analysis of Kramers-Kronig transformation reveal that the first electronic transition band redshifted on heating. This result is in good agreement with the redshift that has been frequently observed in the low-energy band tail of the X (1)A(1)-->A (1)B(1) absorption band.