Abstract
Abstract The decay-curves of the Balmer-lines Hα and Hβ have been measured after dissociative excitation of C6H6 and H2 by electron-impact in the 100 eV range. The analysis of the decay-curves shows, in agreement with other authors, that only the 3s-and 3d-states in the case of Hα and the 4s-and 4d-states in the case of Hβ contribute significantly to the total intensity of Hα and Hβ, respectively, but not the p-states 3p and 4p. The intensity-ratios J(3s)/J(Ha) and J(4s)/J(Hβ) have been investigated. Comparison with the total emission cross-sections of the states n=3 and n=4 allows to determine the excitation cross-sections of the sublevels 3s and 4s. It is found that s-state production is favoured in the dissocia-tion process. This seems to be independent on the principal quantum number.
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