Aberration correction in the Scanning Transmission Electron Microcope (STEM) is pushing the achievable spatial resolution for imaging and spectroscopy into the sub-angstrom regime, providing a new level of insight into the structure/property relations of complex materials. The combination of atomic-resolution Z-contrast scanning transmission electron microscopy and electron energy loss spectros...

The electronic spectroscopy and photodissociation dynamics of the I3 radical are investigated with two experimental methods. The ground and several low-lying excited states of the I3 radical are characterized by photoelectron spectroscopy of I3 2 at 213 nm. Assignments of these states are discussed with reference to recent calculations. In addition, photodissociation of the I3 radical was inves...

The optical properties and electronic structure of aluminium nitride are determined using valence electron energy-loss spectroscopy in a dedicated scanning transmission electron microscope. Quantitative analysis of the experimental valence electron energy-loss spectra to determine the electronic structure encompasses single scattering deconvolution of the valence electron energy-loss spectra to...

Scanning capacitance microscopy and spectroscopy combined with numerical simulations have been used to image nanoscale electronic structures in In0.30Ga0.70N/GaN quantum-well heterostructures grown by metalorganic chemical vapor deposition. Macroscopic capacitance– voltage spectroscopy and numerical simulations indicate that, depending on the bias voltage applied, either electron or hole accumu...

By applying a phase-modulation fluorescence approach to 2D electronic spectroscopy, we studied the conformation-dependent exciton coupling of a porphyrin dimer embedded in a phospholipid bilayer membrane. Our measurements specify the relative angle and separation between interacting electronic transition dipole moments and thus provide a detailed characterization of dimer conformation. Phase-mo...

We report the study of both occupied and unoccupied electronic states of biphenyl adsorbed on Si 100 by using synchrotron radiation ultraviolet photoemission spectroscopy, x-ray photoemission spectroscopy, and near-edge x-ray absorption fine structure spectroscopy. The results are compared with calculations of the occupied densities of states. Evidence is given of two main effects: i a down shi...

Ultrathin SiO2 films on Mo 112 were synthesized using different preparation procedures and characterized with ultraviolet photoelectron spectroscopy UPS , metastable impact electron spectroscopy MIES , and polarization modulation infrared reflection absorption spectroscopy PM-IRAS . By correlating the vibrational and electronic data, an assignment of the prominent spectral features are made. Th...

The recent spectroscopy of water vapour in the ground electronic state is reviewed. Experimental advances from the microwave to the near ultraviolet spectral regions are surveyed. On the theoretical front, new approaches to the calculation of vibration–rotation energy levels are covered. Water spectroscopy finds extensive application in astronomy, atmospheric science and combustion research. An...

Aberration correction in the Scanning Transmission Electron Microcope (STEM) is pushing the achievable spatial resolution for imaging and spectroscopy into the sub-angstrom regime, providing a new level of insight into the structure/property relations of complex materials. The combination of atomic-resolution Z-contrast scanning transmission electron microscopy and electron energy loss spectros...