Interatomic potential of the HgNe van der Waals complex in theE(3Sgr;+) Rydberg state

摘要

The lowest Rydberg stateE(3Sgr;+) of the HgNe van der Waals complex has been investigated by opticalndash;optical double resonance (OODR) spectroscopy using two intermediate electronic states ofAthinsp;30+andBthinsp;31. TheEndash;Bband exhibits an oscillatory freendash;bound continuum, which reflects a Franckndash;Condon projection of the wave function of theBstate onto the repulsive part of theEstate potential. In theEndash;Aband, two relatively sharp peaks are observed together with a freendash;bound continuum showing an asymmetric interference structure. The observed intensity patterns of theEndash;BandEndash;Abands are interpreted by a potential barrier characteristic of theEstate potential, which traps two quasibound vibrational states in the inner well. Based on (i) the observed Franckndash;Condon pattern of the freendash;bound transitions; (ii) the transitionrsquo;s wave number of the boundndash;bound transitions in theEndash;Aband; and (iii) the rotational constants of the quasibound (v=0 andv=1) levels in theEstate, the interatomic potential of theEstate is derived by a numerical simulation. The height of the potential barrier measured from the dissociation limit of Hg (7thinsp;3S1)+Ne is determined to be 153 cmminus;1and the interatomic distance at the top of the barrier to be located at 3.9(1) Aring;.