Stable junctions between a single carbon chain and two single-wall carbon nanotubes were produced via coalescence of functionalized fullerenes filled into a single-wall carbon nanotube and directly imaged by in situ transmission electron microscopy. First principles quantum chemical calculations support the observed stability of such molecular junctions. They also show that short carbon chains bound to other carbon structures are cumulenes and stable semiconductors due to Peierls-like distortion. Junctions like this can be regarded as archetypical building blocks for all-carbon molecular electronics. ; Original Publication: Felix Boerrnert, Carina Boerrnert, Sandeep Gorantla, Xianjie Liu, Alicja Bachmatiuk, Jan-Ole Joswig, Frank P Wagner, Franziska Schaeffel, Jamie H Warner, Ronny Schoenfelder, Bernd Rellinghaus, Thomas Gemming, Juergen Thomas, Martin Knupfer, Bernd Buechner and Mark H Ruemmeli, Single-wall-carbon-nanotube/single-carbon-chain molecular junctions, 2010, PHYSICAL REVIEW B, (81), 8, 085439. http://dx.doi.org/10.1103/PhysRevB.81.085439 Copyright: American Physical Society http://www.aps.org/