Experimental and theoretical investigations of HeNeI trimer.

We report on the results of spectroscopic studies of the HeNeI van der Waals trimer using the two-step two-color HeNeI(E0 , v = 0-3 ←hνB0 , v = 19 ←hνX0 , v = 0) excitation scheme. The excitation spectra of the HeNeI(B, E) decay product luminescence and the luminescence spectra of I ion-pair states formed after HeNeI(E) decay have been recorded and analyzed. The HeNeI(X, B, E) binding energies have been estimated to be less than 111.