The emission of radiation near 600 Å by helium

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Abstract
Free-free radiative emission by a pair of atoms is discussed, and explicit formulae are derived for the free-free spontaneous emission rate, which include contributions from quasi-bound resonating states. The theory is applied to the interpretation of helium emission near 600 Å, and it is suggested that the 600 Å emission bands arise primarily from transitions from quasibound resonating vibrational levels of the A 1Σu + state of He2. Analysis of the emission data leads to a dissociation energy of 2·50 eV for the A 1Σu + state.

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