Abstract

Improved formulae for the intensity profile of the rotational lines have been derived for the [<i>nd</i>σΣ⁺, <i>nd</i>ππ, <i>nd</i>δΔ] (Hund's case d)-<i>n'p</i>ππ (case b) electronic bands of diatomic molecules with respect to the <i>l</i>-uncoupling interaction among the upper states. As an application of the formulae, the rotational temperature in the dc discharge plasma was determined from the analysis of the band structure of the He₂[3<i>d</i>σ<i>f</i>³Σ⁺_<i>u</i>, 3<i>d</i>π<i>f</i>³π_<i>u</i>, 3<i>d</i>δ<i>f</i>³Δ_<i>u</i>] ← 2<i>p</i>π<i>b</i>³π_<i>g</i> (0-0) absorption bands. The formulae were also applied to the H₂[3<i>d</i>σ<i>g</i>³Σ⁺_<i>u</i>, 3<i>d</i>π<i>i</i>³π_<i>u</i>, 3<i>d</i>δ<i>j</i>³Δ_<i>u</i>] → 2<i>p</i>π<i>c</i>³π_<i>g</i> (0-0) emission bands.

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