Identification of Electronic Transitions in Polyacetylene by Acoustic Phonon Spectroscopy

Anomalous Phonon-Vibration Frequencies in Metallic Ultrathin Films Studied by Resonant Acoustic-Phonon Spectroscopy and Ab-initio Calculations

The phonon frequencies of metallic ultrathin films were studied by the resonant acoustic-phonon spectroscopy using femtosecond pump-probe method. We excite and detect the acoustic-phonon resonances in the thin films thinner than 50 nm using the femtosecond light pulses. The pump light causes the phonon vibrations through the thermal expansion at the film surface. For the ultrathin films, the st...

Imaging of a patterned and buried molecular layer by coherent acoustic phonon spectroscopy

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Electronic coherence dynamics in trans-polyacetylene oligomers.

Electronic coherence dynamics in trans-polyacetylene oligomers are considered by explicitly computing the time dependent molecular polarization from the coupled dynamics of electronic and vibrational degrees of freedom in a mean-field mixed quantum-classical approximation. The oligomers are described by the Su-Schrieffer-Heeger Hamiltonian and the effect of decoherence is incorporated by propag...

Acoustic-phonon anomaly in MgB2

‏‎suppression of coke formation in thermal cracking by coke inhibitors‎‏

‏‎the main purpose of this research was to:1.develop a coking model for thermal cracking of naphtha.2.study coke inhibition methods using different coke inhibitors.developing a coking model in naphtha cracking reactors requires a suitable model of the thermal cracking reactor based on a reliable kinetic model.to obtain reliable results all these models shall be solved simultaneously.for this pu...