Models of picosecond-scale mobilities in glassy and polycrystalline quinoline

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Abstract
The observed inhomogeneous band broadening of the 1033-cm−1 ir C—H in-plane deformation fundamental of quinoline in a glassy state and a polycrystal at 115 K was related to the theoretical concepts of the underlying vibrational T2 processes. The motional narrowing model that fits best the spectral data and reflects the particular physical nature of the locally-ordered glass is the recently introduced stretched ("extended", "fractional") exponential exp [−(t/τ)α]. Extension of the model to shorter time regimes is discussed. The modulation model which simulates the corresponding spectral data and describes the longer-range order of the polycrystal is the damped oscillator exp (−tγ/2) [cos θt + (γ/2θ) sin θt], previously proposed for oscillator – lattice mode coupling.

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