The modifications of the microstructure of myoglobin deposited onto SERS-active Ag-based substrates by drying a drop of aqueous solution with and without laser irradiation and the corresponding surface-enhanced Raman scattering (SERS) spectra are studied. It is shown that drying with laser irradiation leads to the formation of protein aggregates of various types, including crystal-like aggregates. It is also shown that after such drying, the aggregates generally have SERS spectra characterized by a change in the position of the vibration bands and the ratios of their amplitudes compared to the spectra of proteins dried without additional treatment. In particular, parts of the SERS spectra of aggregates formed under laser irradiation are characterized by an additional enhancement (up to 100×) compared to the SERS spectra of myoglobin dried in air at room temperature. The crystallization processes were modeled using the results of atomic force microscopy morphology studies of dried myoglobin on the SERS-active substrates to determine the conditions under which crystal-like aggregates start to grow at surface irregularities, specifically those with a volume close to that of the critical-size nucleus, and where the lowest energy of formation occurs. A correlation is established between surface irregularities, the amplitude, and the change in the SERS spectra during the drying of a myoglobin solution sample on a nanostructured Ag-based surface.

Raman spectra of crystalline gallium arsenide grown by the Czochralski method have been studied. It has been demonstrated that the frequency of the coupled plasmon–phonon mode increases with increasing electron concentration n and approaches the frequency of the transverse vibration mode at n ~ 3 × 10¹⁸ cm⁻³. An increase in the hole concentration leads to a broadening of the longitudinal vibration peak. The relative intensity of the transverse mode decreases with an increase in the degree of disorder.

An experimental study of erosion craters formed during the synthesis of nanoparticles of various metals (Cu, Fe, Ti, Al, Sn) by the spark discharge method, conducted by the authors in previous works, revealed two key findings: first, a significant correlation between crater diameters and their depths, and second, a correlation between crater diameters and the erosive ability of different metals as well as their thermophysical properties. An attempt was made to compare experimental data with erosion resistance criteria proposed by various authors, such as the enthalpy per unit volume of the metal at the melting point (Volchenkova) or the criterion proposed by Palatnik. It was found that copper exhibits anomalous behavior: its median crater diameter and depth are significantly smaller than expected from the general trend. This work attempts to interpret experimental data based on known solutions to certain heat propagation problems, including the problem with a moving phase boundary. A qualitative agreement was established between the calculated depth of the phase boundary and the experimental crater depths, as well as the values of the average current density in the electrode spot. For copper, the calculated melting-through depth substantially exceeds the experimental values.

Density functional theory calculations have been used to determine the adsorption and desorption potentials of pyrolysis products on the substrate in the GaAs_xP_{1 – x}/GaAs metalorganic vapor phase epitaxy process. The results have been used in kinetic Monte Carlo simulation of the behavior of the pyrolysis products on the growth surface, with allowance for adsorption, desorption, and diffusion. The simulation results agree well with experimental data. The proposed calculation algorithm can be used to study the adsorption–desorption behavior of materials in other systems.