14 Atoms

MICROWAVE SPECTRA OF THE METHYLCYANOPOLYYNES CH3(CC)nCN, n = 2, 3, 4, 5
Wei Chen, J.-U.Grabow, M. J. Travers, Michaeleen R. Munrow,
Stewart E. Novick, M. C. McCarthy, and P. Thaddeus
Journal of Molecular Spectroscopy, 192: 1-11, 1998
link to paper

ROTATIONAL SPECTRA OF THE CARBON CHAIN FREE RADICALS C10H, C12H, C13H, AND C14H
C. A. Gottlieb, M. C. McCarthy, M. J. Travers, J.-U. Grabow, and P. Thaddeus
Journal of Chemical Physics,109: 5433-5438, 1998
link to paper