Abstract
This paper reports simultaneous measurements of the time dependence of the intensities of spectral lines and bands and that of the number density of atomic and molecular ions in decaying helium plasmas. The validity and reliability of mass-spectrometric probing of a decaying plasma is checked by comparing the values obtained for the ambipolar diffusion coefficient of He + and He + 2 with those measured by means of other techniques. The results showed that, in the wavelength region of 3000 Å to 7000 Å, the spectral line emission by a decaying helium plasma is a consequence of the collisional radiative recombination process He + + 2 e → He ∗ + e → He + e + hv. No evidence was found for the occurence of the dissociative recombination process He + 2 + e → He ∗ + + He → 2He + hv. The spectral band emission was determined to be caused by the collisional radiative recombination process He + 2 + e + X → He ∗ 2 + X → 2He + X + hv where the identity of X is as yet not difinitely established but it not a helium atom in the ground state.
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