Abstract
The quantum dynamics of low-energy free electrons colliding with linear carbonaceous species like HC3N and HC5N is examined to identify the locations and structural features of their metastable negative ions (resonant compound states of the colliding partners) with the aim of suggesting, at the molecular level, the possible mechanisms of anionic stabilization which lead to the several stable species observed in the interstellar and circumstellar media in connection with polyyne structures.
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