Abstract
Inelastic electron tunneling spectra of 1- and 2-naphthoic acids were measured at 4.2 K with the aluminum electrode biased negatively and positively with respect to the lead electrode. The naphthoic acid molecules were transferred onto the alumina surface by a vacuum deposition technique. The complete inelastic electron tunneling vibrational spectra are presented and the line positions are listed in the table. We have observed an enhanced noise level in the energy range above 1800 cm−1 in the tunneling spectra of some multiring aromatic dopants. The noise appears in a particularly strong form in the spectra of 1- and 2-naphthoic acids. One of the aims of the present experiments was also to study the character of this noise.
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