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Vibrational spectroscopy of adsorbed molecules using Self-Assembling Tunnel Junctions
xiii, 321 leaves : illustrations ; 28 cm.
We have systematically studied the performance and I-V
characteristics of Self-Assembling Tunnel Junctions (SATJ's)
as a new configuration of inelastic electron tunneling
spectroscopy (IETS) for measuring vibrational spectra of
molecules on metal surfaces. In a SATJ, the oxide layer
associated with metal-insulator-impurity-metal junctions in a
typical IIETS configuration is replaced by an inert gas film.
One advantage of the SATJ configuration is that the junction
barrier is truly adjustable. The resistance of the junction
can be adjusted over four orders of magnitude and yet the
SATJ is observed to have enough stability to perform IETS in
a point-contact geometry. We have measured the vibrational
spectra of both inert barrier junctions and those doped with
hydrogen and acetylene. "Clean" junctions in which the
barrier consists of a pure rare-gas (neon) film show, as
expected, no significant peaks in the spectrum. Acetylene
doped junctions exhibit peaks corresponding to vibrational
modes of the acetylene molecules. In addition, a zero-bias
feature (ZBF), typical in double junctions, appears to be a
universal feature of the SATJ, although its presence is not
understood in our single junction geometry.
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Includes bibliographical references: pages 109-115.