Femtosecond studies of electron dynamics at dielectric-metal interfaces

Article Abstract:

A study was conducted to investigate electron relaxation processes at metal surfaces in the presence of thin layers of insulating or wide energy gap materials. The experiment demonstrated that the perpendicular spatial extent of the electronic wavefunction at the interface primarily determines the inter-band relaxation rate of electrons or relaxation from the interfacial states to the metal bulk bands. Experimental results and implications are discussed.

Case studies, Surface chemistry, Dielectric relaxation, Relaxation phenomena, Relaxation (Physics), Electron mobility

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Femtosecond dynamics of electrons photoinjected into organic semiconductors at aromatic-metal interfaces

Article Abstract:

The electronic dynamics at the naphthalene/Ag(111) and the anthracene/Ag(111) interfaces are investigated with femtosecond time and angle resolved two photon photoemission. The results show that the transition from a near resonant to a non resonant interaction between the image potential and the adsorbate electron affinity levels causes significant variations in binding energies.

Science & research, Electrons

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Specific heat of molecular crystals from atomic mean square displacements with the Einstein, Debye, and Nernst-Lindemann models

Article Abstract:

The analysis of atomic displacement parameters (ADPs) from multitemperature diffraction data has provided mean-field frequencies for molecular translation and liberations of both the Debye- and Einstein-type. The comparison of Debye, Einstein and Nernst-Lindmann models are illustrated by using naphthalene, anthracene and hexamethylenetetramine (HMT).

Cyclohexane, Structure

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