Spectroscopic Investigation of cis-2,4-Difluorophenol Cation by Mass-analyzed Threshold Ionization Spectroscopy

• DOI: 10.5012/bkcs.2014.35.3.815
• Publication Date: 2014-04-15T02:10:44Z
• Authors: Vidya Shivatare; Wen Bih Tzeng
• Keywords: Photoexcitation; Atmospheric-pressure laser ionization

We applied the two-color resonant two-photon ionization and mass-analyzed threshold techniques to record vibronic cation spectra of 2,4-difluorophenol. As supported by our theoretical calculations, only cis form 2,4-difluorophenol involves in photoexcitation pulsed field processes. The band origin <TEX>$S_1{\leftarrow}S_0$</TEX> electronic transition cis-2,4-difluorophenol appears at 35 647 <TEX>${\pm}2cm^{-1}$</TEX> adiabatic energy is determined be 70 <TEX>$030{\pm}5cm^{-1}$</TEX>, respectively. Most observed active vibrations electronically excited <TEX>$S_1$</TEX> cationic ground <TEX>$D_0$</TEX> states mainly involve in-plane ring deformation vibrations. Comparing these data with those phenol, cis-2-fluorophenol, 4-fluorophenol, we found that there an additivity rule associated shift resulting from additional fluorine substitution.