Nanostructured carbon films produced by supersonic cluster beam deposition have been studied by in situ Raman spectroscopy. Raman spectra show the formation of a sp2 solid with a very large fraction of sp-coordinated carbyne species showing a long-term stability under ultra high vacuum. Distinct Raman contribution from polyyne and cumulene species have been observed. The long-term stability and the behavior of carbyne-rich films under different gas exposure have been characterized showing different evolution for different sp configurations. Our experiments confirm theoretical predictions and demonstrate the possibility of easily producing a stable carbyne-rich pure carbon solid. The stability of the sp2-sp network has important implications for astrophysics and for the production of novel carbon-based systems.
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