Summary: *Corresponding author.
E-mail address: firstname.lastname@example.org (G. Agnolet)
Physica B 284}288 (2000) 1842}1843
Intensity studies of inelastic electron tunneling spectra
Glenn Agnolet *, Darin T. Zimmerman
Department of Physics, Texas A&M University, College Station, TX 77843-4242, USA
Department of Physics, Penn State Altoona College, Altoona, PA 16601-3760, USA
Inelastic electron tunneling spectroscopy (IETS) using metal}insulator}metal (MIM) tunnel junctions is an established
technique for studying the vibrational modes of molecules adsorbed on metal surfaces. We are examining a new geometry
for IETS in which the oxide layer of the MIM junction is replaced by an atomically thin gas "lm. `Cleana junctions in
which the barrier is composed of pure neon exhibit Ohmic behavior except in the region near zero bias. When the neon
barrier is doped with acetylene molecules, we observe peaks corresponding to the vibrational modes of these molecules.
An analysis of the inelastic peak intensities indicates that dipole scattering is not the principle mechanism of the
electron}molecule interaction in this geometry. 2000 Elsevier Science B.V. All rights reserved.
PACS: 33.20.!t; 73.40.Gk; 73.40.Rw; 87.64.Je
Keywords: Inelastic electron tunneling spectroscopy; Molecular vibrational spectroscopy; Point contact spectroscopy
Recently, we demonstrated that self-assembling tunnel
junctions (SATJs)  have the necessary stability to
perform inelastic electron tunneling spectroscopy (IETS)