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A method is proposed for determining rovibronic term values of diatomics fromexperimental data on the wavenumbers of electronic-vibro-rotational spectrallines. In contrast to existing techniques, the new one is based on theRydberg-Ritz principle only. It is shown that a link between a set ofrovibronic term values and a set of wavenumbers of observed rovibronic spectrallines appears when three and more different electronic-vibrational states arepairwise-connected by radiative transitions. The method differs from knowntechniques in several aspects, namely, it: 1) doesn't need any assumptionsconcerning an internal structure of a molecule; 2) doesn't involve anyintermediate parameters (as molecular constants in traditional techniques); 3)gives an opportunity to use in one-stage optimization procedure all availableexperimental data obtained for various band systems, by various authors, and invarious works; 4) provides in an interactive mode the opportunity to select theexperimental values, eliminating rough errors, to revise wrong identificationsof spectral lines and to compare various sets of experimental data for mutualconsistency; 5) allows to obtain not only an optimal set of rovibronic termvalues, but also the error bars depending on quantity and quality of existingexperimental data. Necessary precondition for use of this method is apreliminary identification of electronic-vibro-rotational lines to certainelectronic-vibro-rotational radiative transitions. For this purpose one has touse traditional methods of the analysis of molecular spectra.Comment: 10 pages, 2 figures, in Russia

Determination of the electronic-vibrational-rotational terms of diatomic molecules from measured wave numbers