The B′ 1Σ_u+ → X 1Σ_g+ and D 1Π_u → X 1Σ_g+ band systems of molecular hydrogen

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Abstract

Spectral line positions and emission probabilities of the B′ 1 Σ u + → X 1 Σ g + and D 1 Π u → X 1 Σ g + band systems of molecular hydrogen have been calculated by solving a system of four coupled Schrödinger equations. A great number of rotational lines, emitted by a low-pressure electric discharge in H 2 , have been identified from 122 nm down to 78 nm. All the 69 bands of the B′ 1 Σ u + → X 1 Σ g + system and many high-J lines of 145 bands of the D 1 Π u → X 1 Σ g + system are reported for the first time. Improved molecular constants are derived for the (unperturbed) electronic excited state D 1 Π u − .

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