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The emission spectrum of electron-bombarded superfluid helium has been measured as a function of wavelength between 550 and 2500 {}. The spectrum is characterized by a very intense asymmetric band of continuous emission peaking at approximately 800 {} with half-width of roughly 150 {}, along with a series of less intense bands between the wavelengths of 620 and 710 {}. This continuum is due to the radiative dissociation of neutral He₂ molecules in the reaction A¹Σᵤ⁺→X¹Σg⁺.
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Stockton et al. (1970) studied this question.
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