Rovibronic structure in the electron energy spectrum for associative ionization: Ne(3 P 2), Ar(3 P 2)+H

Abstract

Associative ionization in thermal energy (300 K) collisions between Ne(2p 5 3s 3P2), Ar(3p 5 4s 3P2) metastable atoms and hydrogen atoms H(ls 2S1/2) has been studied by high resolution (20 meV) electron spectrometry. The spectra exhibit structure due to the formation of different vibrational states in the molecular ion and show superimposed rotational structure. Direct information is obtained on the relative population of the rovibronic states and on their energy positions. The well depth of the ionic potential curves has been determined as : D e (Ne H + X 1 X +) = 2.27 (3) eV, D e (Ar H + X 1 X +) =4.02(3) eV.

A comparative basis‐set study of NeH+ using coupled‐cluster techniques

“…The results for Urban et al [15] were calculated by the present authors since we have access to the diatomic potential energy curves of those authors. Additionally, the predicted dissociation energy of 2.300 eV is within 0.024 eV of the Lorenzen et al [37] experimental estimate. The experimental errors on these experimental estimates are, unfortunately, quite large (20.032 eV) and thus give little help in determining the overall accuracy of the calculated potential curve.…”

Ionization of hydrogen and deuterium atoms in thermal energy collisions with state-selected Ne(3s 3 P 2,3 P 0) metastable atoms

“…In collisions of the heavier rare gas metastable atoms R with open-shell targets one has to consider the effect of the fine-structure associated with the npS-core, and it is not a priori clear that both metastable states R(n pS(n + 1) s 3P2, 3Po) will exhibit the same interaction with a particular target. PIES of closed-shell atoms (Ar, Kr, Xe, and Hg) has shown [36] that the interactions of Ne(3P2) and Ne(3p0) with these targets are very similar, whereas it was found in studies of hydrogen and alkali atoms that strong differences do in fact occur [21,25,27,28,37]. In this paper we report our results for the systems Ne(3P2, 3P0) + H, D in detail.…”

“…In this paper we report our results for the systems Ne(3P2, 3P0) + H, D in detail. Figure 1 shows a cut through the central part of the apparatus used for PIES, which has been described in detail before [25,36,38]. A well-collimated beam of metastable Ne(3P2) or Ne(3Po) crosses a quasibeam of H(D) atoms in the magnetically-shielded reaction chamber.…”

“…The 90 ~ standard spectra were calculated from the calibration data due to Gardner and Samson [39] after correcting these for angular distribution effects such that intensities relevant for 90 ~ resulted on the basis of known anisotropy parameters: [40,41]. In the appendix, we give a list of the 90 ~ standard intensities, as used for calibration in this and other work [25,36,38]. The ion energy spectra were transmission-corrected on the same basis.…”

“…Electrons ejected at right angle to both beams are energy-analysed in a cylindrical condenser, operated at the constant transmission energy atoms. The cylindrical condenser has been used for some time [25,27,36,38], whereas the reaction chamber (RC), lens system (V 0-V3) , and the slits have been modified subsequent to the work described in . The symmetric double-slits S1 and $2 have the sizes l xl0mm 2 and 0.4• 2.…”