D
David A. Newnham
Researcher at British Antarctic Survey
Publications - 29
Citations - 2109
David A. Newnham is an academic researcher from British Antarctic Survey. The author has contributed to research in topics: Terahertz radiation & Electron precipitation. The author has an hindex of 17, co-authored 29 publications receiving 1957 citations. Previous affiliations of David A. Newnham include St. John's University.
Papers
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Journal ArticleDOI
Terahertz pulsed spectroscopy and imaging in the pharmaceutical setting--a review.
J. Axel Zeitler,J. Axel Zeitler,J. Axel Zeitler,Philip F. Taday,Philip F. Taday,David A. Newnham,Michael Pepper,Michael Pepper,Keith C. Gordon,Thomas Rades +9 more
TL;DR: This review focuses on the development and performance of pharmaceutical applications of terahertz technology compared with other tools for physical characterization.
Journal ArticleDOI
Using Terahertz Pulsed Spectroscopy to Quantify Pharmaceutical Polymorphism and Crystallinity
Clare J. Strachan,Philip F. Taday,David A. Newnham,Keith C. Gordon,J. Axel Zeitler,Michael Pepper,Thomas Rades +6 more
TL;DR: In this study, four drugs with different solid-state properties were analyzed using TPS and levels of polymorphism and crystallinity were quantified, demonstrating that TPS is an analytical technique of potential in quantifying solid- state properties of pharmaceutical compounds.
Journal ArticleDOI
Using terahertz pulsed spectroscopy to study crystallinity of pharmaceutical materials
Clare J. Strachan,Thomas Rades,David A. Newnham,Keith C. Gordon,Michael Pepper,Philip F. Taday +5 more
TL;DR: In this paper, the application of terahertz pulsed spectroscopy to polymorphic, liquid crystalline and amorphous forms of pharmaceutical compounds has been investigated and it was shown that the modes observed are due to crystalline phonon and possibly hydrogen-bonding vibrations.
Proceedings ArticleDOI
Hidden object detection: security applications of terahertz technology
TL;DR: In this article, the authors examined the properties of barrier and potential confusion materials, and showed that barrier materials have smooth spectra with relatively low attenuation, while confusion materials have more complex spectra.
Journal ArticleDOI
Integrated absorption intensity and Einstein coefficients for the O2 a1Δg-X3Σg- (0,0) transition: a comparison of cavity ringdown and high resolution Fourier transform spectroscopy with a long-path absorption cell
TL;DR: In this paper, two experimental techniques of cavity ringdown spectroscopy and high-resolution, long-path Fourier transform (FTT) spectrograms have been used to measure quantitative absorption spectra and determine the integrated absorption intensity (Sint,B) for the O2 a 1Δg −X 3 Σg− (0,0) band Einstein A-factors and radiative lifetimes for the 0,0 band.