Phys. Rev. Lett. 84, 1527–1530 (2000)Control and Characterization of a Multistep Unimolecular ReactionReceived 6 October 1999; published in the issue dated 14 February 2000 Electrons from a scanning tunneling microscope were used to break a C-H bond in a single acetylene (HCCH) molecule adsorbed on Cu(001) at 9 K. The product ethynyl (CCH) was characterized by imaging, inelastic electron tunneling spectroscopy, and variable temperature measurements of the rotation rate. Significant changes in the vibrational spectra and bonding geometry accompanied HCCH dissociation. The ethynyl was further dehydrogenated to form dicarbon (CC). Dissociation studies of the isotopes HCCD and DCCD permitted unambiguous identification of the reaction products. © 2000 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.84.1527
DOI:
10.1103/PhysRevLett.84.1527
PACS:
68.35.Ja, 34.50.Ez, 61.16.Ch, 82.30.Lp
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