The radiation of a spin-free particle in the field of a plane electromagnetic wave

In this paper, we obtained a solution for the equation of motion of a charged spinless particle in the field of a plane electromagnetic wave. Relativistic expressions for the cross section of Compton scattering by a charged particle of spin 0 interacting with the field of a plane electromagnetic wave are calculated. Numerical simulation of the total probability of radiation as the function of the electromagnetic wave amplitude is carried out. The radiation probability is found to be consistent with the total cross section for Compton scattering by a charged particle of spin 0.

Влияние неопределенности значений вероятностей спонтанного излучения на температурное поведение коэффициентов ударного самоуширения спектральных линий молекул CO-=SUB=-2-=/SUB=-

The influence of the deviation of the spontaneous radiation probability of the spectral lines of CO2 A on the temperature dependence of the collisional self-broadened coefficients γ in solving the inverse problem of joint determination of A and γ from the array of absorption coefficients is studied. The study was carried out for two cases: 1) A=0.2022 s-1 (HITRAN2012); 2) the values of A were obtained by minimizing the sum of weighted squares of the absorption coefficients differences. It was found that in the temperature range of 300-700 K, when the absorption coefficients are measured with accuracy 0.05∙αmin, the deviation of the functions γ(T) does not exceed 5%. There is no causal relationship between the parameters γ and A. The method of least squares allows us to correctly calculate the temperature dependences of the collisional self-broadened coefficients of the CO2 lines γ(T).

Сильная связь экситонов в микрорезонаторах GaN гексагональной формы

The GaN planar hexagonal microcavities were grown by a selective vapor phase epitaxy. The spectra were measured by the low-temperature cathodoluminescence method in-situ scanning electron microscope. The obtained spectra show a huge Rabi splitting (in order of 100 meV). Numerical simulation of the spatial distribution of the modes’ intensities of a hexagonal resonator is shown. Some modes can have strong spatial localization, leading to strong coupling with the exciton and huge Rabi splitting. Theoretically, we calculated the fraction of excitons in polariton modes, which correlates with the intensity of exciton radiation associated with these modes, for microcavities of a hexagonal shape. Thus, we have obtained the form of the dependence of the radiation probability on the eigenfrequencies of the structure.

An internal conversion coefficient for the outermost electron shell in xenon

The observed intensity of the singly charged ions in the charge spectrum produced by the isomeric decay of 12-day 131 Xe is used in conjunction with a theoretical estimate of the radiation probability of the (5 p –1 s ) X-ray transition in the K series of xenon, to yield a value for the internal conversion coefficient of the 163 keV γ -ray in the 5 p shell. The value so obtained is 0∙21 ± 0∙03.