Terahertz Analysis of Quinacridone Pigments

• DOI: 10.1007/s10762-016-0333-2
• Publication Date: 2016-11-22T07:29:51Z
• Authors: A. D. Squires; M. Kelly; R. A. Lewis
• Keywords: Engineering; Physical Sciences and Mathematics; 02 engineering and technology; 0210 nano-technology; 01 natural sciences; 0104 chemical sciences

We present terahertz spectroscopy and analysis of commercially available quinacridone pigments in the 0–5 THz range. Our results show clear distinction between the β and γ crystalline phases responsible for the deep violet (β) to red (γ) colour pigments. We reveal a large number of absorptions in the terahertz regime shown to depend on the constituent phase as well as temperature.