新しい界面選択的な偶数次非線形分光

抄録

Novel interface-selective second-(χ⁽²⁾) and fourth-order (χ⁽⁴⁾) nonlinear spectroscopic techniques were developed to study liquid interfaces. χ⁽²⁾ electronic sum frequency generation (ESFG) spectroscopy enabled us to obtain interfacial electronic spectra with an unprecedented high signal-to-noise ratio and dense wavelength data points, whereas frequency-domain χ⁽⁴⁾ Raman spectroscopy provided vibrational spectra of solute molecules adsorbed at interfaces for the whole fingerprint region. Because these new even-order electronic and vibrational nonlinear spectroscopies utilize only visible and near-infrared laser pulses, they are applicable to the study of a variety of “buried” interfaces.