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Volume 110, Issue 5, 01 February 1999
110(1999); http://dx.doi.org/10.1063/1.477965View Description Hide Description
The pulsed-field-ionization (PFI) zero-kinetic-energy (ZEKE) photoelectron spectra of and have been recorded in the region From the analysis of the photoelectron spectra the first adiabatic ionization potential of and has been determined to be and respectively. A one-dimensional model for the pseudorotation between three equivalent equilibrium structures shows evidence for a fluxional behavior of
110(1999); http://dx.doi.org/10.1063/1.477966View Description Hide Description
A knee-shaped feature observed earlier in light scatteringspectra of (CKN) below is used as a strong argument in favor of mode-coupling theory of the glass transition (MCT). Our careful measurements reveal no “knee” in the spectra of two glass forming liquids, CKN and ortho-terphenyl. Instead of the knee the spectra show nontrivial broadening and an increase of the intensity with a temperature increase. Both variations are confirmed by neutron scatteringmeasurements on CKN and are neither expected in the asymptotic MCT predictions nor in any other model.