title: Nuclear Spin Singlet Order Selection by Adiabatically Ramped RF Fields.
abstract: We describe an NMR method to generate singlet order in spin pairs from longitudinal spin magnetization and suppress residual background signals. This method can also be used for generating and observing long-lived spin states. A singlet order selection (SOS) filter is proposed, which allows us to find signals of the spin pair of interest buried in a crowded NMR spectrum. Likewise, SOS filtering enables proton NMR measurements in H2O without pulse sequences for solvent suppression. We demonstrate that the method works perfectly for both weakly and strongly coupled spin pairs. Furthermore, it can be combined with standard NMR pulse sequences: in this way, T1- and T2-relaxation times for spin pairs of interest can be measured. The power of the SOS-filter is demonstrated by relaxation studies in biomolecules.
authors: International Tomography Center, Siberian Branch of the Russian Academy of Science , Institutskaya 3A, Novosibirsk 630090, Russia.|Novosibirsk State University , Pirogova 2, Novosibirsk 630090, Russia.
authors: Alexey S
authors: AS
authors: Kiryutin
authors: International Tomography Center, Siberian Branch of the Russian Academy of Science , Institutskaya 3A, Novosibirsk 630090, Russia.|Novosibirsk State University , Pirogova 2, Novosibirsk 630090, Russia.
authors: Andrey N
authors: AN
authors: Pravdivtsev
authors: International Tomography Center, Siberian Branch of the Russian Academy of Science , Institutskaya 3A, Novosibirsk 630090, Russia.|Novosibirsk State University , Pirogova 2, Novosibirsk 630090, Russia.
authors: Alexandra V
authors: AV
authors: Yurkovskaya
authors: International Tomography Center, Siberian Branch of the Russian Academy of Science , Institutskaya 3A, Novosibirsk 630090, Russia.|Institut für Experimentalphysik, Freie Universität Berlin , Arnimallee 14, Berlin 14195, Germany.
authors: Hans-Martin
authors: HM
authors: Vieth
authors: International Tomography Center, Siberian Branch of the Russian Academy of Science , Institutskaya 3A, Novosibirsk 630090, Russia.|Novosibirsk State University , Pirogova 2, Novosibirsk 630090, Russia.
authors: Konstantin L
authors: KL
authors: Ivanov
mesh_terms: D004744:Enkephalin, Methionine / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D009842:Oligopeptides / Q000737:chemistry*; D066244:Proton Magnetic Resonance Spectroscopy / Q000592:standards; D012015:Reference Standards; D025801:Ubiquitin / Q000737:chemistry*
chemical_list: D009842:Oligopeptides; D025801:Ubiquitin; D004744:Enkephalin, Methionine