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The generalized k-moment method is formulated in terms of Cutteridge–Devyatov polynomials (CDP). In this novel approach, the moments involved are spectral averages of integer powers of the logarithm of the absorption coefficient. The technique to obtain k-distributions from those generalized moments is detailed both theoretically and from a practical point of view. Its outputs are afterward assessed...
We present measurements of the complete scattering matrix as a function of the scattering angle of a sample of calcite particles. The measurements are performed at 647nm in the scattering angle range from 3° to 177°. To facilitate the use of the experimental data we present a synthetic scattering matrix based on the measurements and defined in the full range from 0° to 180°. The scattering matrix...
Absorption spectra of carbon dioxide, 12 C 16 O 2 , have been studied in the three wavenumber ranges (8790–8860, 9340–9650 and 11,430–11,505cm −1 ) of the near infrared region using spectrophotometric complex of V.E. Zuev Institute of Atmospheric Optics based on an Bruker IFS 125 HR and a 30m multipass cell with the White type optical system. The spectra were recorded...
The goal of this study is to explore some effects of surface roughness on phase functions of hexagonal ice crystals. The simulations were performed using a Monte-Carlo ray-tracing method. The peculiarity of our statistical model of surface roughness is the following: (a) the surface roughness of the prismatic facets can be anisotropic, and (b) the roughness degree of basal and prismatic facets can...
A higher-order dispersive finite-difference time-domain (FDTD) method has been proposed to accurately model cloaking structures. In the proposed method, the higher-order FDTD scheme with second-order accuracy in time and fourth-order in space has combined with the shift operator algorithm. The exotic electromagnetic parameters of the cloaks are taken into account using shift operator based on dispersive...
Three-colour three-step photoionization spectroscopy of uranium has been performed in a U–Ne hollow cathode discharge tube by temporally resolving three-colour photoionization optogalvanic (PIOG) signal from the normal optogalvanic (OG) signal using three tunable pulsed dye lasers. U–Ne hollow cathode discharge tube has been used as a source of uranium atomic vapours and photoionization detector....
New rotational line strengths for the C 2 Swan system (dΠg3–aΠu3) have been calculated for vibrational bands with v′=0–10 and v″=0–9, and J values up to J=34–96, using previous observations in 33 vibrational bands. Line positions from several sources were combined with the results from recent deperturbation studies of the v′=4 and v′=6 levels, and a weighted global least squares fit was performed...
Precise profiles of the 60-GHz molecular oxygen band recorded earlier in a wide temperature range by means of a resonator spectrometer at atmospheric pressure were treated. High signal-to-noise ratio allows careful study of the band shape taking into consideration the mixing effect. Comparative analysis of the band profile calculated by an extended MPM (Millimeter-wave Propagation Model) and by the...
In a previous note a generalized Beer's law was discussed in relation to the space-fractional Poisson process to explain possible deviations from the exponential extinction law in spatially correlated media. Here a different point of view will be developed, applying a Wright type function to describe the probability of photon transmission in random media. We find the analytic form of the photon mean-free-path...
We analyze the UV–vis absorption spectra of zinc oxide water colloids, prepared by pulsed laser ablation in liquids (PLAL), through a theoretical approach based on the multipole expansion of the electromagnetic fields and the transition matrix method. We reproduce the optical behaviour of these colloidal solutions also at wavelengths shorter than the one at the absorption edge. We extend our analysis...
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