Accession Number : ADA130438

Title :   Raman Spectroscopic Study of Molecular Orientation in AgTCNQ Thin Films.

Descriptive Note : Technical rept.,

Corporate Author : BROWN UNIV PROVIDENCE RI DEPT OF CHEMISTRY

Personal Author(s) : Kamitsos,Efstratios ; Risen,William M , Jr

PDF Url : ADA130438

Report Date : 18 Feb 1983

Pagination or Media Count : 35

Abstract : Preferential orientation of TCNQ(-) units in thin AgTCNQ films, which were prepared by thermal treatment of vapor-deposited materials on various substrates, is demonstrated by laser Raman spectroscopy. The polarization dependence of Raman intensities in four scattering arrangements have been obtained by varying the polarization direction of the incident light. The experimental results for Raman intensities as a function of substrate orientation are compared with those predicted for films with TCNQ(-) units with various postulated types of orientation relative to the substrate and to each other, and also compared with those obtained from AgTCNQ solution. The data show that AgTCNQ thin films are characterized by preferred orientation of the TCNQ(-) units relative to the substrate at an angle theta approx. or equal to 45 degrees. The lack of other orientation in the sampled region is taken to indicate that there are many relatively small domains, within each of which theta approx. or equal to 45 degrees, which are not oriented with respect to each other. (Author)

Descriptors :   *Thin films, *Molecular structure, *Raman spectroscopy, Silver compounds, Technetium compounds, Nitroguanidine, Charge transfer, Orientation(Direction), Substrates, Scattering

Subject Categories : Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE