9 research outputs found
The power and prospects of fluorescence microscopies and spectroscopies.
Recent years have witnessed a renaissance of fluorescence microscopy techniques and applications, from live-animal multiphoton confocal microscopy to single-molecule fluorescence spectroscopy and imaging in living cells. These achievements have been made possible not so much because of improvements in microscope design, but rather because of development of new detectors, accessible continuous wave and pulsed laser sources, sophisticated multiparameter analysis on one hand, and the development of new probes and labeling chemistries on the other. This review tracks the lineage of ideas and the evolution of thinking that have led to the actual developments, and presents a comprehensive overview of the field, with emphasis put on our laboratory's interest in single-molecule microscopy and spectroscopy
Dopant atom distribution and spatial confinement of conduction electrons in Sb-doped nanoparticles
Pure and Sb-doped SnO
We describe photoemission results from pure and
Sb-doped SnO2 nanoparticles deposited on gold substrates.
Photoelectron spectra with synchrotron radiation were recorded for
Sn 3d, Sb 3d and O 1s core levels and valence bands in the 500-1200 eV
energy range. For pure SnO2 nanoparticles the surface
is terminated by an oxygen rich layer with no obvious surface
environment for Sn. When doped n-type with 9.1% or 16.7% Sb,
dopant atoms are concentrated near the surface of the
nanoparticles. The valence state of the dopant atoms is
predominantly SbV. Plasmon satellite features are also
observed in core level photoemission spectra and their intensity
relative to the main peak increases with increasing photon energy