title: Dependence of NMR noise line shapes on tuning, matching, and transmission line properties.
abstract: The tuning and matching conditions of rf circuits, as well as the properties of the transmission lines connecting these to the preamplifier, have direct consequences for NMR probe sensitivity and as for the optimum delivery of rf power to the sample. In addition, tuning/matching conditions influence radiation damping effects, which manifest themselves as fast signal flip-back and line broadening effects, and can lead to concentration-dependent frequency shifts. Previous studies have also shown that the appearance of spin-noise and absorbed circuit noise signals heavily depended on tuning settings. Consequently, all these phenomena are linked together. The mutual connections and interdependences of these effects are highlighted and reviewed here.
authors.affiliation: Chemistry Department, New York University New York, NY, 10003.
authors.forename: Eli
authors.initials: E
authors.lastname: Bendet-Taicher
authors.affiliation: Institute of Organic Chemistry, Johannes Kepler University Altenbergerstraße 69, 4040, Linz, Austria.
authors.forename: Norbert
authors.initials: N
authors.lastname: Müller
authors.affiliation: Chemistry Department, New York University New York, NY, 10003.
authors.forename: Alexej
authors.initials: A
authors.lastname: Jerschow
keywords: NMR noise; transmission line