Single crystal optical properties of two forms of tetrathiafulvalenium iodide (TTF-In)

R. J. Warmack, T. A. Callcott

Research output: Contribution to journalArticlepeer-review

7 Scopus citations

Abstract

Polarized specular reflectance measurements over the energy range 0.6-5 eV are reported for two crystalline forms of tetrathiafulvalenium iodide (TTF-In). Since the plane of each TTF molecule is either approximately parallel or perpendicular to an external face of each crystal, polarized reflectance measurements can sample the various symmetry-allowed electronic transitions of the TTF molecule. The optical constants have been determined by means of a Lorentzian oscillator fit. A Drude-like edge is seen for light polarized along the conducting axis of monoclinic TTF-In (n∼0.7). Structure in the reflectance data for light polarized perpendicular to the stacking axes in both forms of TTF-In is interpreted as being primarily due to in-plane transitions of the TTF+ ion. Transitions polarized along the long and short axes of the TTF+ ion in orthorhombic TTF-In (n=2) can be resolved to aid in the assignment of the transitions for the TTF+ ion.

Original languageEnglish
Pages (from-to)3238-3241
Number of pages4
JournalPhysical Review B
Volume14
Issue number8
DOIs
StatePublished - 1976
Externally publishedYes

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