Abstract
By the impact of an electron beam (100–450 eV) on aliphatic hydrocarbons (C2H2, C2H4, C4H6), cyclo-octadienes, and aromatic molecules (C6H6, C10H8, C12H10, etc.) at about 10−3Torr, the Schuler’s T spectrum of diacetylene ion (A2Πu–X2Πg) was observed in the 505–570 nm region, in addition to the well-known systems of H(Balmer), CH(A–X), and C2(Swan). Three different kinds of mechanisms for the formation of C4H2+ (A) were derived from the dependence of the emission intensity on the electron-beam current and the gas pressure: (a) the primary excitation process (C4H6), (b) the secondary excitation process (aromatic molecules, cyclooctadienes), and (c) the dimerization excitation process (C2H2, C2H4). The intensity ratio (C4D2+/C4H2+) of the T spectrum from C6H6 and C6D6 was 0.83±0.04 for the (0,0) sequence at 300 eV excitation.
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