The topography of the Au submonolayer condensate formed by pulsed laser deposition (PLD) on pyrolitic graphite surface has been studied by scanning-tunneling microscopy (STM). PLD technique is characterized by an extremely high instantaneous deposition rate (up to 10(22) atoms cm(-2) s(-1)). The formation of Au fractal nanoclusters with D = 1.33 +/- 0.08 was observed with STM. The mechanism driving the formation of fractal nanoclusters on the surface at high deposition rate is suggested to be the result of the interacting-adatom initial-states evolution in the system far from thermodynamic equilibrium. The geometrical structure of the forming nanoclusters depends critically on the rate at which atoms arrive at the surface as well as on its lattice symmetry.

The radiation from MeV electrons penetrating a single crystal has been studied. Coherent bremsstrahlung and channeling radiation are discussed theoretically with particular emphasis on the relation between the two phenomena. The close connection becomes clear when the coherent bremsstrahlung is interpreted as radiation from transitions between free states of motion relative to a set of planes, while the planar-channeling radiation is due to transitions between bound states in the planar averaged potential. Detailed calculations of the one-dimensional band structure for such states have been carried out for the case of 4 MeV electrons in silicon, which has also been studied experimentally. In the measured forward-radiation spectra, free-to-free, bound-to-bound, and also free-to-bound transitions have been identified, and the observed energies and intensities are in good agreement with the predictions.

Sharp lines in the bremsstrahlung spectrum have been observed for 1.5-4-MeV electrons channeled along a $〈111〉$ direction in silicon. The lines originate in transitions between bound states in the axial transverse potential and may be described as characteristic radiation from a two-dimensional atomlike system moving with relativistic velocity in the $〈111〉$ direction.

The shapes of crystal-blocking angular distributions have been used to study the fission decay of excited compound nuclei produced by bombardment of tungsten with $^{16}\mathrm{O}$ ions. The results show that while most of the fission decays (\ensuremath{\sim}80%) occur with lifetimes too short to be measured by the blocking technique ($\ensuremath{\tau}\ensuremath{\lesssim}{10}^{\ensuremath{-}18}$ sec), a large fraction (\ensuremath{\sim}20%) corresponds to lifetimes $\ensuremath{\tau}\ensuremath{\gtrsim}{10}^{\ensuremath{-}16}$ sec. This indicates a significant contribution from fission after evaporation of several neutrons.