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

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 − .