Electronic structure of Ne2 below the first ionization limit

Abstract

Results from new laser excitation spectra of 20Ne2 have been combined with previously published experimental and theoretical data to provide a consistent picture describing many of the Rydberg states observed below the first ionization limit. These states are found to fall mainly into Rydberg series converging on the ...3σu X 2Σ+u ground core of Ne+2. Spectral data for the npσ 3Σ+g←a 3Σ+u and npπ 3Πg←a 3Σ+u series support the current assignments of the upper states. Although (0–0) bands dominate these series, other vibronic transitions are observed. The 6–23pσ 3Σ+g–a(0–0) bands are more perturbed than the npπ 3Πg–a(0–0) series; hence, data for 4–17pπ 3Π+g–a(0–0) and 4–6fλ(3Σ+g,3Π+g)–a(0–0) were used to determine a value of 34 409±2 cm−1 for the lowest ionization limit of 20Ne2. Rotational constants for the v=0 levels of 4–17pπ 3Πg and 10–23pσ 3Σ+g also are presented.

Characterization of afterglow kinetics at atmospheric pressures by emission spectroscopy: II. Reactions of neon ions with Xe

“…Transitions between the two states, induced by electron collisions, would be expected to occur frequently. Nevertheless, using a corona discharge operated at 160-270 mbar neon pressure, sufficient amounts of metastable molecules could be produced to subsequently photoexcite and characterize the Rydberg series of Ne 2 states (Kim et al 1992).…”

Spectroscopic characterization of the potential energy functions of Ne2 Rydberg states in the vicinity of the Ne(1S0)+Ne(4p′) dissociation limits

“…The dimers are model systems for studying atomatom interactions [3] and represent a starting point to describe the properties of larger rare-gas clusters [4,5]. Several experimental and theoretical studies have been devoted to the ground and first excited singlet states of Ne 2 [6][7][8][9][10] and to its triplet Rydberg states [10][11][12][13][14][15][16][17][18][19][20], which were studied from the metastable a 3 R þ u state. The six low-lying electronic states of the Ne þ 2 ion have been studied by microwave electronic spectroscopy [21,22] and ab initio quantum chemistry [23].…”