Vibronic coupling in the valence band photoemission of the ferroelectric copolymer: poly(vinylidene fluoride) (70%) and trifluoroethylene (30%).

摘要: Two different vibrational contributions to the photoemission fine structure of ferroelectric copolymer poly(vinlylidene fluoride) with trifluoroethylene (CH2−CF2:CHF−CF2, 70%:30%) are identified. The at higher binding energies associated two closely placed υa,s (CH2) stretching modes while smaller energies, is due a δ bending mode. contribution mode decreases decreasing temperature. We associate this temperature dependence importance symmetry in vibronic coupling process and increased dipole ordering organic system.