Accession Number : ADA263359


Title :   AC Scanning Tunneling Spectroscopy of Self-Assembled Monolayers on Gold


Descriptive Note : Technical rept. 1 Jun 1992-31 May 1993


Corporate Author : PENNSYLVANIA STATE UNIV UNIVERSITY PARK DEPT OF CHEMISTRY


Personal Author(s) : Stranick, S J ; Weiss, P S ; Parikh, A N ; Allara, D L


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a263359.pdf


Report Date : 30 Mar 1992


Pagination or Media Count : 14


Abstract : We demonstrate the spectroscopic capabilities of an AC scanning tunneling microscope. This AC scanning tunneling microscope has a bias voltage modulation frequency tunable over the range DC-20 GHz and is thus capable of recording images and local spectra of insulating as well as conducting substrates. In this paper we detail the spectral sensitivity and the tip-sample separation dependence of the spectra recorded by simultaneously tuning the modulation and detection frequencies. Spectra of an evaporated gold film and of self-assembled monolayers of CH3(CH2)15SH and of CH302C(CH2)15SH on gold are presented.


Descriptors :   *LAYERS , *GOLD , SCANNING , DETECTION , HARMONICS , VOLTAGE , SENSITIVITY , CHEMICAL COMPOSITION , SPECTRA , TUNING , THIOLS , MICROWAVE FREQUENCY , BIAS , MICROSCOPES , MODULATION , TUNNELING , MOLECULAR STRUCTURE , SEPARATION , IMAGES , SURFACES , ALKANES , SUBSTRATES , FILMS , MOLECULES , METHYL RADICALS


Subject Categories : Organic Chemistry
      Coatings, Colorants and Finishes
      Electricity and Magnetism
      Atomic and Molecular Physics and Spectroscopy


Distribution Statement : APPROVED FOR PUBLIC RELEASE