Orientation Sensitive Terahertz Resonances Observed in Protein Crystals
Gheorghe Acbas, Edward Snell, A. G. Markelz
TL;DR
This paper introduces Crystal Anisotropy Terahertz Microscopy (CATM), a new method for measuring the anisotropic terahertz response in small crystals, revealing orientation-dependent resonances and water absorption effects.
Contribution
The paper presents a novel microscopy technique, CATM, for analyzing anisotropic terahertz responses in small crystals, including proteins, with demonstrated results on sucrose and protein samples.
Findings
Sucrose shows expected anisotropic phonon resonances.
Protein crystals exhibit suppressed broadband water absorption.
Resonant features depend on orientation and hydration.
Abstract
A method is presented for measuring anisotropic THz response for small crystals, Crystal Anisotropy Terahertz Microscopy (CATM). Sucrose CATM measurements find the expected anisotropic phonon resonances. CATM measurements of protein crystals find the expected broadband water absorption is suppressed and strong orientation and hydration dependent resonant features.
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Taxonomy
TopicsTerahertz technology and applications · thermodynamics and calorimetric analyses · Spectroscopy and Quantum Chemical Studies