Articles you may be interested inEffect of reactive species on surface crosslinking of plasma-treated polymers investigated by surface force microscopy Appl.Clarification of oxygen bonding on diamond surfaces by low energy electron stimulated desorption and high resolution electron energy loss spectroscopy Time-resolved investigation of the surface chemical modification of poly(ethylene naphthalate) by nitrogen plasma treatmentThe plasma modification of polystyrene with low pressures of nitrogen, ammonia, and oxygen has been studied by high-resolution electron energy loss spectroscopy. The method is shown to be capable of detecting nitrogen incorporation by variations in NH stretching band intensity and oxygen incorporation by carbonyl related bands. The method is particularly sensitive to loss of aromaticity as seen by evolution of the aromatic and aliphatic CH stretching band intensities.

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The first detailed vibrational mode assignments for insulating polystyrene surfaces based on high-resolution electron energy loss spectroscopy (HREELS) are presented. Improvements in energy resolution based on low-energy secondary beam neutralization and spectral restoration algorithms allow an effective resolution of ∼6 meV (50 cm-1) at relatively high loss intensities. This permits the assignment of eighteen vibrational modes for this material which are in good agreement with known IR and Raman bands.

Solvent and pressure dependences of the absorption (430–300 nm) and fluorescence spectra of anthronitrile are reported and compared with earlier studies of anthracene. The origins of the solvent dependences are analyzed in terms of dielectric theories developed by McRae and by Baur and Nicol. Satisfactory fits of the experimental data are obtained, which suggest that the dipole moment of the 1La excited singlet state of anthronitrile is 2.5±1.0 times as large as the dipole moment of the ground state. Two absorption bands at 27.4±103 and 28.8× 103 cm−1 (in hexane solutions) are assigned as the 1Lb transition, and the solvent dependences of these bands are interpreted as suggesting that the dipole moment of the molecule is not changed by this transition. Although pressure dependences of the spectra of polymethylmethacrylate and polyacrylonitrile solutions of anthronitrile can be qualitatively interpreted in terms of the solvent dependences, quantitative discrepancies between the anthronitrile and anthracene results indicate that solvent shift theories based upon the dielectric continuum approximation are inadequate to explain the pressure dependences quantitatively.

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