<title>Quasiclassical description for rovibrational spectra of tetraatomics: the case of PH<formula><inf><roman>3</roman></inf></formula></title>

Abstract

Some new applications ofso-called Rotational Energy Surface (RES) are discussed. As shown before, the method allows to discover some important qualitative features in rovibrational spectra of triatomics -e.g., energy level clustering. While trying to generalize the results, we developed a universal numerical procedure, allowing, particularly, to predict the formation of6-fold energy clusters in spectra ofPH3 by quasiclassical means.