Carr-Purcell-Meiboom-Gill (CPMG) experiments were made upon sedimentary rock samples at different RF pulsation rates. A dispersion of the transversal relaxation rate was observed. The experiments revealed that due to the diffusional processes there is a diminution of the second moment of the absorption line with the delay time between the RF pulses and the echo time, with a complex evolution characterized either as a stretched exponential or a power-law behavior as a function of the echo time, with parameters dependent on the characteristic time of the experiment, i.e., the delay between RF pulses. Results show that the observed behavior is dependent on permeability and geometrical properties of the sedimentary rock.

Scheme of coaxial microwave gas-discharge plasma source based on a “plasma resonance” phenomenon is presented. Possibility of conditions realization at which energy of accelerated in the “resonance” electrons goes into ionization processes (in volume of chamber outside of “resonance” region) is discussed. Results of experimental investigation of a coaxial microwave plasmatron in which “resonance” mechanisms have been manifested are presented. A plasmachemical reactor based on a “resonance” plasmatron is described. The data on plasmachemical decomposition of CF2Cl2 are displayed.

The behavior of illuminated Pt/a-Si:H Schottky barrier has been studied by numerical calculations. The electric field, the electrons and holes currents, the charge space and the recombination rate where calculated as function of the position. The photocurrent, when the front of the barrier is illuminated by different wavelengths under lower reverse applied voltage, tends towards saturation. By comparing the number of collected carriers to the incoming photons, we remark that the collection of photogenerated carriers is partial for long wavelengths (λ ≥ 600 nm), in this case the collection efficiency is determined by the recombination in the bulk, and total when the short wavelengths (λ < 600 nm) are used and the recombination in the front layer seems to be an important carrier loss mechanism. This is mainly the consequence of the virtual cathode apparition that behaves against the carrier collection. This cathode moves to back contact and tends to disappear with increasing the reverse bias voltage.

This paper aims at investigating the influence of the dielectric support on the indications of single axis and three-axis low frequency electric field meters obtained during their calibration. The modification of the calibration field due to the dielectric support, experienced by the meter probe, is predicted by a Boundary Element model and experimentally compared with the actual probe indication, considering both a parallel plate set-up and a TEM cell for the generation of the reference field. The perturbing effect, estimated for different dielectric supports, is found to be greatly amplified and frequency dependent when considering lossy dielectric materials.

We characterized two samples consisting of photoresist layers on silicon with square arrays of square holes by spectroscopic ellipsometry (SE) and Mueller matrix polarimetry (MMP). Hole lateral dimensions and depths were determined by fitting either SE data taken in conventional planar geometry or MMP data in general conical diffraction configurations. A method for objective determination of the optimal measurement conditions based on sensitivity and parameter correlations is presented. When applied to MMP, this approach showed that for one of the samples the optimal incidence angle was 45°, much below the widely used 70° value. The robustness of the dimensional characterisation based on MMP is demonstrated by the high stability of the results provided by separated fits of the data taken at different azimuthal angles.