Abstract
Threshold photoelectron spectrum of CH2F2 in the photon energy range of 12.45–14.10 eV was re-investigated by means of a combination of photo-electron-photoion coincidence experiments and density functional theory calculations. A series of vibrational peaks were distinctly observed in this range. Using optimized geometries and vibrational frequencies of the CH2F2 neutral and its cation in ground state at the M06-2X/cc-pVTZ level of theory, Franck-Condon factor simulations were conducted. Taking into account anharmonicity influences, a perfect agreement between the simulated and experimental spectra has been achieved. From the reliable vibrational assignments, adiabatic and vertical ionization energies of CH2F2 are derived as 12.371 ± 0.010 eV and 13.281 ± 0.010 eV, respectively. In addition, the experimental frequencies of four vibrational modes with ai symmetry for CH2F2+(X2B1) ions are determined.
Published Version
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