arXiv subjects

M. S. Ryazanov

Publications and source records attributed to M. S. Ryazanov.

3 recordsLinked to original sources

arXiv2005

Tables of rovibronic term values for singlet electronic states of BH molecule

The method for objective (based on Ritz principle only) and optimal determination of electronic-vibro-rotational (rovibronic) term values from meassured wavenumbers recently proposed in our previous paper is applied for singlet electronic states of $^{11}$BH molecule, namely $X^1Σ^+$, $A^1Π$, $C'^1Δ$, $B^1Σ^+$, $C^1Σ^+$, $D^1Π$, $E^1Σ^+$, $F^1Σ^+$, $G^1Π$, $H^1Δ$, $I^1Σ^+$, $J^1Σ^+$. All known to authors experimental data on the wavenumbers of rovibronic spectral lines are used. Those are the wavenumber values of 1563 spectral lines of 15 band systems, obtained in 10 different original papers. As a result 529 term values with their standard deviations were derived.

physics.chem-ph↗

arXiv2004

On determination of electronic-vibro-rotational term values of diatomic molecules from measured wavenumbers

A method is proposed for determining rovibronic term values of diatomics from experimental data on the wavenumbers of electronic-vibro-rotational spectral lines. In contrast to existing techniques, the new one is based on the Rydberg-Ritz principle only. It is shown that a link between a set of rovibronic term values and a set of wavenumbers of observed rovibronic spectral lines appears when three and more different electronic-vibrational states are pairwise-connected by radiative transitions. The method differs from known techniques in several aspects, namely, it: 1) doesn't need any assumptions concerning an internal structure of a molecule; 2) doesn't involve any intermediate parameters (as molecular constants in traditional techniques); 3) gives an opportunity to use in one-stage optimization procedure all available experimental data obtained for various band systems, by various authors, and in various works; 4) provides in an interactive mode the opportunity to select the experimental values, eliminating rough errors, to revise wrong identifications of spectral lines and to compare various sets of experimental data for mutual consistency; 5) allows to obtain not only an optimal set of rovibronic term values, but also the error bars depending on quantity and quality of existing experimental data. Necessary precondition for use of this method is a preliminary identification of electronic-vibro-rotational lines to certain electronic-vibro-rotational radiative transitions. For this purpose one has to use traditional methods of the analysis of molecular spectra.

physics.optics↗

arXiv2003

Determination of absolute densities of B, Al, Ga and Si atoms in non-equilibrium plasmas from relative intensities in resonance multiplets distorted by reabsorption

The approach proposed recently as a spectroscopic tecnique of a boron density determination in microwave plasma has been expanded for B, Al, Ga, Si atoms and generalized. The method is based on measurements of relative intensities of pairs of spectral lines belonging to resonance multiplets having common upper level. It is shown that when the reabsorption of the lines within plasma is sufficient, then the intensity ratios depend on the gas temperature T and the product NL of total density of the ground state atoms N and a length of a plasma column L. Thus in the case of the B, Al, Ga doublets the temperature T should be known. The resonance multiplet of Si (three independent intensity ratios) provides an opportunity to obtain both T and N and even to organize internal check of the applicability of the proposed method to certain plasma conditions. The ratios were calculated for resonance lines of B, Al, Ga and Si under T=300-2400 K and NL=10^7-10^15 cm^(-3) m. The results of numerical calculations and ranges of applicability of the method are discussed.

physics.plasm-ph↗