Partial energy level diagram showing some triplet and quintet levels of O atoms and the transitions feeding the and levels.
A schematic diagram of the experimental setup.
Optical emissions from , , and discharges for ten different multiplets of O atom (a) around 844.6 nm, (b) around 777.4 nm, (c) around 436.8 nm, (d) around 394.7 nm, (e) around 700.2 nm, (f) around 615.7 nm, (g) around 595.8 nm, (h) around 533.0 nm, (i) around 725.4 nm, and (j) around 645.5 nm.
Spectra of from , , and discharges for the first negative system in (a) 596.5–609 nm and (b) 520–532 nm regions.
Energies and lifetimes of different metastable states in He, Ne, and Ar.
Comparison between discharges in , , and on four multiplets of O atoms directly feeding the levels and another six multiplets feeding the levels.
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