An improved third order dipole moment surface for methane
Résumé
In a previous article a dipole moment surface (DMS) of full-electron, multi-reference configuration interaction (MRCI) quality was obtained and used to calculate the rotational spectrum of methane vibrational ground state, by means of a combination of the mean field configuration interaction method (VMFCI) with a generalized perturbation theory. The theoretical line intensities were matching the experimental ones obtained at the SOLEIL synchrotron well within experimental uncertainties. However, not all third order terms were included in this DMS. In the present work, additional DMS points have been calculated and fitted using a complete third order expansion. The new results give R-branch intensities systematically smaller by about 1 percent compared to those previously obtained by using the same ab initio method, so still within experimental errors. The relevance of this DMS to calculate intensities for excited vibrational states, in particular for the dyad, is adressed.
Fichier principal
dms-ch4-rev1.pdf (194.98 Ko)
Télécharger le fichier
Fig_2.pdf (600.04 Ko)
Télécharger le fichier
Fig_3.pdf (571.72 Ko)
Télécharger le fichier
dms-ch4-rev1-supp.pdf (250.01 Ko)
Télécharger le fichier
fig_1.pdf (36.73 Ko)
Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte
Format : Autre
Format : Autre
Format : Autre
Format : Autre