Lifetime of negative molecular ions of tetracene and pentacene with respect to the autodetachment of an electron |
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Authors: | R V Khatymov R F Tuktarov M V Muftakhov |
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Institution: | 1.Institute of the Physics of Molecules and Crystals, Ufa Research Center,Russian Academy of Sciences,Ufa,Russia |
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Abstract: | The processes of nondissociative resonant attachment and autodetachment of electrons in a number of poly-cyclic aromatic hydrocarbon
molecules have been investigated by mass spectrometry. Long-lived negative molecular ions of phenanthrene and triphenylene
have not been observed. Such ions have been detected for anthracene, pyrene, and benzoe]pyrene capturing thermal electrons.
Negative molecular ions of tetracene and pentacene have also been observed up to 2.5–3 eV. The lifetimes of these ions with
respect to the auto-detachment of an electron have been measured throughout the energy range where they are observed. This
lifetime for tetracene and pentacene is more than 10 ms, which is two or three orders of magnitude larger than that for remaining
compounds. Correlation between the lifetime of ions and the electron affinity of the molecules has been revealed. |
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