Abstract
SynopsisWe have investigated a fast formation channel yielding helium excited (bound) molecular states He2 from heavy-body conversion of n=3 manifold He* atomic species, proposed by Frost et-al in 2001 (J.Phys.D, 34 1569). Optical emission spectroscopy has been employed to measure the time-dependent intensity of ∼20 atomic and molecular lines between λ=300-820nm from a short-pulse excited dielectric barrier discharge operating at 50-1000mbar. Correlations between atomic and molecular emission traces suggest that the singlet molecular state populations (D1Σu+, E1Πg, F1Σu+) can be attributed to conversion of the atomic He*(31S) state whilst the triplet molecular states are derived from the He*(33S) state.
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