title: Emission of nuclear quadrupole resonance from polycrystalline hexamethylenetetramine.
abstract: The angular dependence of the nuclear quadrupole resonance (NQR) signal intensity emitted from polycrystalline hexamethylenetetramine has been analytically investigated for all directions for non-contact detection of chemicals by nuclear quadrupole resonance. The field pattern of the NQR signal from a column sample was measured. The emitted patterns were the same as that from a united single magnetic dipole, which fitted well to the estimation based on quadrupole principle axis system. This result is helpful to design an antenna for NQR remote detection.
authors: ota@sup.ee.es.osaka-u.ac.jp
authors: G
authors: G
authors: Ota
authors: H
authors: H
authors: Itozaki
mesh_terms: D016880:Anisotropy; D004574:Electromagnetic Fields; D009682:Magnetic Resonance Spectroscopy; D008709:Methenamine / Q000737:chemistry*; D009584:Nitrogen / Q000032:analysis; D033362:Powder Diffraction; D011208:Powders / Q000032:analysis / Q000737:chemistry; D012815:Signal Processing, Computer-Assisted; D013113:Spin Labels
chemical_list: D011208:Powders; D013113:Spin Labels; D008709:Methenamine; D009584:Nitrogen