The interpretation of X-ray photoelectron spectroscopy (XPS) data relies on measurement models that depend on several parameters, including the photoelectron attenuation length and X-ray photon flux. However, some of these parameters are not known, because they are not or cannot be measured. The unknown geometrical parameters can be lumped together in a multiplicative factor, the alignment parameter. This parameter characterizes the ability of the exciting light to interact with the sample. Unfortunately, the absolute value of the alignment parameter cannot be measured directly, in part because it depends on the measurement model. Instead, a proxy for the experimental alignment is often estimated, which is closely related to the alignment parameter. Here, a method for estimating the absolute value of the alignment parameter based on the raw XPS spectra (i.e. non-processed photoelectron counts), the geometry of the sample and the photoelectron attenuation length is presented. The proposed parameter estimation method enables the quantitative analysis of XPS spectra using a simplified measurement model. All computations can be executed within the open and free Julia language framework PROPHESY. To demonstrate feasibility, the alignment parameter estimation method is first tested on simulated data with known acquisition parameters. The method is then applied to experimental XPS data and a strong correlation between the estimated alignment parameter and the typically used alignment proxy is shown.

No abstract

Aim and Scope: There presented results of microbiological studies of the sensitivity of the phytopathogenic bacterium excitant of the blackened stem of potato Dickeya solani to ultraviolet (UV) radiation. Materials and Methods: As sources of the biocidal radiation, a pulsed xenon lamp and a mercury lamp of low pressure were used. Result and Discussion: It is shown that the pulsed xenon lamp has a more pronounced antimicrobial effect with respect to the D. solani bacterium than the mercury lamp. Conclusion: The obtained results testify the prospects of application of UV disinfection technologies in a complex of phytosanitary measures against bacteriosis during the preparation of seed stock and long-term storage.

The techniques of total spectral energy and electrical measurements of high-current pulsed arc discharge are presented and substantiated. On the example of a flash lamp, three working circuits were reviewed and the following values were obtained: time dependences for circuit electrical parameters, values of the energy deposition into plasma, and radiative efficiencies for different spectral ranges.

No abstract