Lanthanum triiodide was investigated by the Knudsen effusion mass spectrometry.
(LaI3)n molecules (n = 1–3) and [I(LaI3)n]− ions (n = 0–4) were registered in the saturated vapor.
The sublimation enthalpy was found by the second and third law of thermodynamics.
The enthalpies of ion-molecular reactions with cluster ions were calculated.
The electron work function of the crystalline LaI3 was obtained.