Description of the absorption spectrum of iodine recorded by means of Fourier Transform Spectroscopy : the (B-X) system

S. Gerstenkom , P. Luc

An in extenso analysis of the (B-X) I2 iodine absorption spectrum recorded by means of Fourier Transform Spectroscopy is presented. It is shown that the 100 000 recorded transitions covering the 11 000-20 040 cm-1 range and published in several Atlases may be recalculated by means of only 46 constants : 45 are Dunham coefficients describing the vibrational and rotational constants of both X state (up to v" = 19) and B state (up to v' = 80, situated only at 1.6 cm-1 from the dissociation limit of the B state), and one empirical scaling factor which takes account of neglected centrifugal constants higher than Mv. The overall standard error between computed and measured wavenumbers is equal to 0.002 cm -1 in agreement with the differences of numerous independent absolute wavenumbers and the computed ones.

Mots clés: Fourier transform spectroscopy; iodine; molecular rotation; molecular vibration; potential energy functions; spectra of diatomic inorganic molecules

Domaines: Articles anciens

S. Gerstenkom, P. Luc. Description of the absorption spectrum of iodine recorded by means of Fourier Transform Spectroscopy : the (B-X) system. Journal de Physique, 1985, 46 (6), pp.867-881. ⟨10.1051/jphys:01985004606086700⟩. ⟨jpa-00210032⟩