The process of desorption for the system of O,/Pd( 111) under excitation by 100 fs pulses of visible light has been examined. Molecular desorption is found to occur with high efficiency and a nonlinear dependence on laser fluence. Direct time-domain measurements using a two-pulse correlation scheme reveal a dominant subpicosecond response together with a weaker, but significant correlation pers...

We show that elastic waves can be excited at a fracture inside a transparent sample by focusing laser light directly onto this fracture. The associated displacement field, measured by a laser interferometer, has pronounced waves that are diffracted at the fracture tips. We confirm that these are tip diffractions from direct excitation of the fracture by comparing them with tip diffractions from...

Antihydrogen production by charge exchange reaction between Positronium atoms and antiprotons requires an efficient excitation of Positronium atoms possibly up to a well defined Rydberg level. A two–step laser light excitation, the first from ground to n = 3 and the second from this level to a n-Rydberg level, is discussed both from the physical and technological point of view. In this study it...

A metallic nanoantenna, under resonant illumination, injects nonequilibrium hot electrons into a nearby graphene structure, effectively doping the material. A prominent change in carrier density was observed for a plasmonic antenna-patterned graphene sheet following laser excitation, shifting the Dirac point, as determined from the gate-controlled transport characteristic. The effect is due to ...

We demonstrate spin polarized jets in extended systems of ballistic exciton-polariton condensates semiconductor microcavities using optical non-resonant excitation geometries. The structure the is determined by digitally reprogrammable, spatially non-uniform, degree circular polarization laser. presence laser excitation, strong particle interactions, and spin-relaxation leads to a tunable spin-...

Rydberg series of C60 are reported for the first time. The Rydberg states are seen in photoelectron spectra using ultrashort pulsed-laser excitation, where the excited states formed are ionized with one further photon from the same laser pulse. The structure is observed for pulse durations as short as 100 fs with indications of residual structure for even shorter pulse excitation. The productio...

In Raman spectroscopic measurements of single cells (human lymphocytes) and chromosomes, using a newly developed confocal Raman microspectrometer and a laser excitation wavelength of 514.5 nm, degradat ion of the biological objects was observed. In the experiments high power microscope objectives were used, focusing the laser beam into a spot 0.5 pm in diameter. At the position of the laser foc...

Using propagating plasmons on silver nanowires as an excitation source we perform surface-enhanced Raman scattering (SERS) at a nanoparticle/wire junction located remotely from the laser illumination spot with sensitivities in a few molecules range. Simultaneous multisite remote-excitation SERS sensing can also be achieved.

Confocal and two-photon fluorescence microscopy techniques using genetically encoded fluorescent probes are widely used in cell biology. Beyond the common problems of photobleaching and phototoxicity, we present evidence that photounbinding also has the potential to compromise such methods, especially in quantitative studies. We show that laser intensities within excitation regimes typical for ...