A time-resolved spectroscopic study of UV/visible emissions from the He*/He*2 (n=3) manifold states: formation channels for fast He*2 production

29th International Conference on Photonic, Electronic, and Atomic Collisions

Carman, R.J.^1 ; Kane, D.M.^1

Dept of Physics and Astronomy, MQ Photonics Research Centre, Macquarie University, Sydney

NSW

2109, Australia^1

关键词: Atomic species;    Dielectric barrier discharges;    Molecular emissions;    Molecular lines;    Molecular state;    Short pulse;    Time dependent;    Time-resolved spectroscopic studies;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/635/3/032079/pdf
DOI  :  10.1088/1742-6596/635/3/032079

来源: IOP

【 摘 要 】

We 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.