Restoring excited particle interaction potentials from laser spectroscopy data: Na broadened by CO2 as an example

Lydia P. Zarkova; Peter S. Pirgov; Gabriela V. Paeva; Nikolay T. Guerassimov; Anatoly P. Nefedov; Vladimir A. Sinel'schikov; Alexandr D. Usachov; Mihail A. Homkin

doi:10.1117/12.262940

27 December 1996 Restoring excited particle interaction potentials from laser spectroscopy data: Na broadened by CO2 as an example

Lydia P. Zarkova, Peter S. Pirgov, Gabriela V. Paeva, Nikolay T. Guerassimov, Anatoly P. Nefedov, Vladimir A. Sinel'schikov, Alexandr D. Usachov, Mihail A. Homkin

Author Affiliations +

Proceedings Volume 3052, Ninth International School on Quantum Electronics: Lasers--Physics and Applications; (1996) https://doi.org/10.1117/12.262940
Event: Ninth International School on Quantum Electronics: Lasers: Physics and Applications, 1996, Varna, Bulgaria

Abstract

Preliminary results of restoring potentials of interactions Na(3s, 3p)-CO₂(X¹(Sigma) _g⁺) from measured far wing spectra of sodium resonance line Na-D perturbed by CO₂ are presented. The spectra in the range of (Delta) (sigma) approximately equals 10-3500 cm^-1 are considered following the quasi-static theory of line broadening by inert gases as continua and due to the A $ARLR X and B $ARLR X transitions of Na-CO₂ quasi-molecules. The reduced absorption coefficient K((sigma) ) at frequency (sigma) equals (sigma) ₀ + (Delta) (sigma) is calculated as corresponding to the radiation from molecules with internuclear separation R, where hc(sigma) equals V^A,B - V^X. As a first approximation, all the three potentials are presented in the shape of a (6,12)-Lennard-Jones potential. The constants C₆ and C₁₂ are determined as independent variables by minimization of the sum of squared deviations between measured and calculated K((sigma) ). Four versions of minimization were considered successively: (1) only red wing, (2) only blue wing (3) both blue and red wings with 6 independent variables (C₆ and C₁₂), and (4) both wings with fixed C₆. The calculated K((Delta) (sigma) ) are compared to the measured ones.

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Lydia P. Zarkova, Peter S. Pirgov, Gabriela V. Paeva, Nikolay T. Guerassimov, Anatoly P. Nefedov, Vladimir A. Sinel'schikov, Alexandr D. Usachov, and Mihail A. Homkin "Restoring excited particle interaction potentials from laser spectroscopy data: Na broadened by CO2 as an example", Proc. SPIE 3052, Ninth International School on Quantum Electronics: Lasers--Physics and Applications, (27 December 1996); https://doi.org/10.1117/12.262940

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