Franck–Condon factors and r -Centroids for the A ¹ Σ ⁺ _u - X ¹ Σ ⁺ _g

Radiative transition parameters for the band system of 107,109Ag2

“…The relative absorption strength (measured signal), I v 0 v 00 , produced by the v 0 v 00 band transition is proportional to the product of three terms (e.g., see [2]):…”

“…and a linear function ½R e ð r v 0 v 00 Þ ¼ a þ b r v 0 v 00 to the measured ratios of absorption strengths for the various 107,109 Ag 2 A À X bands observed by Antić-Jovanović et al [2]. In the latter case, the standard assumption that the ETMF depends parametrically on the r-centroid, r v 0 v 00 , was invoked (see Fraser [17]).…”

“…Recently, Antić-Jovanović et al [2] measured the relative strengths of several 107,109 Ag 2 A À X absorption bands and compared ratios of their measurements with ratios of calculated relative absorption band strengths, obtaining agreement to within ±8%. This is an important development because relative absorption band strength measurements and Franck-Condon factors were heretofore unavailable for this band system.…”

“…Absorption and emission A À X bands from silver dimers in the vapor phase have been observed in the %4000 to 5200 Å range [1][2][3][4][5][6][7]. Given the natural abundances of silver atom isotopes, bands from 107,109 Ag 2 are about twice as intense as bands from the isotope molecules 107,107 Ag 2 and 109,109 Ag 2 , which are typically co-produced by the experimental apparatus.…”

“…In the present work, we assumed constant and linear models for the electronic transition moment function as a function of internuclear distance and performed data fits to the empirical data of Antić-Jovanović et al [2]. We determined the best model and were then able to normalize our electronic transition moment function to absolute data units with the measured radiative lifetime.…”