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Proceedings Paper

An NQR study of the crystalline structure of TNT
Author(s): Robert Menzies Deas; Michael J. Gaskell; Kathryn Long; Neil F. Peirson; Michael D. Rowe; John A. S. Smith
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Paper Abstract

A comparison of the NQR parameters of the monoclinic and orthorhombic phases of TNT and their relation to the twist or dihedral angle between the plane of the NO2 substituents and that of the benzene ring as determined in the X-Ray crystal structure analysis enables an assignment of different frequencies to specific sites in the two independent molecules in the unit cell of both forms to be made. The slow transformation of the metastable orthorhombic phase to monoclinic can then be followed by monitoring the NQR spectrum in which specific lines can be assigned to molecular sites in the two phases. NQR spectra of TNT referred to in the literature often differ; this could be due partly to the TNT often being a mixture of monoclinic and orthorhombic phases and partly to changes in the spectral line width, factors which must be taken into account when NQR is used to detect landmines.

Paper Details

Date Published: 21 September 2004
PDF: 11 pages
Proc. SPIE 5415, Detection and Remediation Technologies for Mines and Minelike Targets IX, (21 September 2004); doi: 10.1117/12.545029
Show Author Affiliations
Robert Menzies Deas, Defence Science and Technology Lab. (United Kingdom)
Michael J. Gaskell, Defence Science and Technology Lab. (United Kingdom)
Kathryn Long, Defence Science and Technology Lab. (United Kingdom)
Neil F. Peirson, King's College London (United Kingdom)
Michael D. Rowe, King's College London (United Kingdom)
John A. S. Smith, King's College London (United Kingdom)

Published in SPIE Proceedings Vol. 5415:
Detection and Remediation Technologies for Mines and Minelike Targets IX
Russell S. Harmon; J. Thomas Broach; John H. Holloway, Editor(s)

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