14N-NQR based device for detection of explosives in landmines

Ostafin, M.; Nogaj, B.

doi:10.1016/j.measurement.2006.04.003

Cited by 51 publications

(34 citation statements)

References 23 publications

(30 reference statements)

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“…[64,67] From their NQR experiments, Karpowicz and Brill [64] reported the following resonances for α-RDX at room temperature. [65] and Ferrari. [67] It has to be noticed that Ferrari recorded the three low-frequency ν 0 resonances at 1.7851, 1.7845 and 1.6912 MHz.…”

Section: Antisymmetric Components Of Shift Tensors In Cyclopropene Dementioning

confidence: 99%

New perspectives in the PAW/GIPAW approach: JP-O-Si coupling constants, antisymmetric parts of shift tensors and NQR predictions

et al. 2010

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In 2001, Pickard and Mauri implemented the gauge including projected augmented wave (GIPAW) protocol for first-principles calculations of NMR parameters using periodic boundary conditions (chemical shift anisotropy and electric field gradient tensors). In this paper, three potentially interesting perspectives in connection with PAW/GIPAW in solid-state NMR and pure nuclear quadrupole resonance (NQR) are presented: (i) the calculation of J coupling tensors in inorganic solids; (ii) the calculation of the antisymmetric part of chemical shift tensors and (iii) the prediction of (14)N and (35)Cl pure NQR resonances including dynamics. We believe that these topics should open new insights in the combination of GIPAW, NMR/NQR crystallography, temperature effects and dynamics. Points (i), (ii) and (iii) will be illustrated by selected examples: (i) chemical shift tensors and heteronuclear (2)J(P-O-Si) coupling constants in the case of silicophosphates and calcium phosphates [Si(5)O(PO(4))(6), SiP(2)O(7) polymorphs and α-Ca(PO(3))(2)]; (ii) antisymmetric chemical shift tensors in cyclopropene derivatives, C(3)X(4) (X = H, Cl, F) and (iii) (14)N and (35)Cl NQR predictions in the case of RDX (C(3)H(6)N(6)O(6)), β-HMX (C(4)H(8)N(8)O(8)), α-NTO (C(2)H(2)N(4)O(3)) and AlOPCl(6). RDX, β-HMX and α-NTO are explosive compounds.

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Section: Antisymmetric Components Of Shift Tensors In Cyclopropene Dementioning

confidence: 99%

New perspectives in the PAW/GIPAW approach: JP-O-Si coupling constants, antisymmetric parts of shift tensors and NQR predictions

et al. 2010

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“…One is from recommended value, 5,6 the other from best-fitted value. The theorem of NQCC mentioned above is often used to the research such as explosives detection in security check, landmine sweeping, 7 phase transition, molecular structure, 8 etc. In this paper, we will use the theorem to investigate the NQCC and η of HMX polymorphs theoretically, due to the importance of HMX in munitions.…”

Section: Introductionmentioning

confidence: 99%

DFT Investigation of Nuclear ¹⁴N Quadrupole Coupling Constants for Four HMX Polymorphs

Shi

Qin

et al. 2010

Chin. J. Chem.

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Density functional theory investigation of 14 N nuclear quadrupole coupling constants (NQCC) for HMX polymorphs was performed. During the calculation of NQCC and asymmetry parameter (η) of β-HMX, single molecule model is found to be worse than cluster model. The calculated results are more sensitive to the proper model than to the basis set. The calculation for β-HMX using cluster model at B3LYP/6-311＋＋G(d,p) level gives better agreement with experiment. This approach was subsequently applied to α, γ, and δ-HMXs. The difference of simulated 14 N NQR frequency was found. The NQR spectrum is useful for the study of explosive or propellant on their detection, phase transition, and aging process.

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“…However, cross polarization techniques require a strong and homogeneous magnetic field, increasing complexity [45] and preventing its use for remote detection. Also, some landmines can be detonated by strong magnetic fields [46].…”

Section: Superconductors and Optical Magnetometersmentioning

confidence: 99%

Nuclear quadrupole resonance for explosive detection

Cardona

Jiménez

Vanegas

2015

Ingeniare. Rev. chil. ing.

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Nuclear quadrupole resonance (NQR) is a spectroscopic technique that can detect explosives of high chemical specificity and therefore it is very suitable for the landmine detection problem. There are several factors affecting the relation of noise signal ratio with NQR: molecular dynamics of relaxation, interference signals, thermal noise, explosive amount, distance, temperature and the design of the detecting system. Literature has searched ways for solving one or more of these factors, but since not all the work has been focused on landmine detection, many have only been tested in simulation or with data obtained under controlled laboratory conditions, where the detection is not remote (there is no separation between the sample and the detection system). This paper makes a review of the state of art in NQR, analyzing its relevance to the landmine detection problem and concluding about unsolved problems that could be the focus of future research.Keywords: Nuclear quadrupole resonance, landmine detection, explosive detection, landmine, demining. RESUMEN

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14N-NQR based device for detection of explosives in landmines

Cited by 51 publications

References 23 publications

New perspectives in the PAW/GIPAW approach: JP-O-Si coupling constants, antisymmetric parts of shift tensors and NQR predictions

New perspectives in the PAW/GIPAW approach: JP-O-Si coupling constants, antisymmetric parts of shift tensors and NQR predictions

DFT Investigation of Nuclear ¹⁴N Quadrupole Coupling Constants for Four HMX Polymorphs

Nuclear quadrupole resonance for explosive detection

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14N-NQR based device for detection of explosives in landmines

Cited by 51 publications

References 23 publications

New perspectives in the PAW/GIPAW approach: JP-O-Si coupling constants, antisymmetric parts of shift tensors and NQR predictions

New perspectives in the PAW/GIPAW approach: JP-O-Si coupling constants, antisymmetric parts of shift tensors and NQR predictions

DFT Investigation of Nuclear 14N Quadrupole Coupling Constants for Four HMX Polymorphs

Nuclear quadrupole resonance for explosive detection

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Product

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DFT Investigation of Nuclear ¹⁴N Quadrupole Coupling Constants for Four HMX Polymorphs