title: Terahertz (far-infrared) characterization of tris(hydroxymethyl)aminomethane using high-resolution waveguide THz-TDS.
abstract: Waveguide THz-TDS using metal parallel plate waveguides is employed to obtain a high-resolution terahertz vibrational spectrum of tris(hydroxymethyl)aminomethane, commonly known as Tris or THAM, an important biological buffer component, a neuroinhibitor and an organic thermal energy-storing molecule. Dropcast and sublimated thin films are used to characterize the sample. The development (with cooling) of 3 broad resonances seen at room temperature into 12 highly resolved spectral features for the dropcast sample and 11 features for a sublimated sample at 13.6 K is tracked by measuring the temperature dependence of the transmission spectrum. Resonances with fwhm linewidths as narrow as 12 GHz are obtained. These results provide strong constraints on theoretical modeling.
authors.affiliation: School of Electrical and Computer Engineering, Oklahoma State University, Stillwater, Oklahoma 74078, USA.
authors.forename: S Sree
authors.initials: SS
authors.lastname: Harsha
authors.forename: D
authors.initials: D
authors.lastname: Grischkowsky
mesh_terms: D000042:Absorption; D008670:Metals / Q000737:chemistry; D013055:Spectrophotometry, Infrared; D013696:Temperature; D055068:Terahertz Spectroscopy; D014325:Tromethamine / Q000737:chemistry*
chemical_list: D008670:Metals; D014325:Tromethamine