Mass-Spectrometric Study of Molecular and Ionic Sublimation of Gadolinium and Terbium Tribromides in Knudsen and Langmuir Modes

摘要

Molecular and ionic sublimation of gadolinium and terbium tribromides in Knudsen and Langmuire modes was studied by the method of high-temperature mass-spectrometry. On the basis of obtained enthalpies of sublimation and ion-molecule reactions the enthalpies of formation of LnBr3 and Ln2Br6 molecules and LnBr_4~- and Ln2Br_7~- negative ions were determined. For the first time the electron work function for crystals of the studied tribromides was calculated.