title: Impurity proton NMR signals from common "proton-free" laboratory materials.
abstract: For the study of small samples (tens of microns cubed) by NMR, impurities from the environment and construction materials (Teflon, Kel-F, glass NMR tubes, etc.) can dominate the signal, in particular for proton NMR. Using pulsed NMR with a resolution of several microseconds, we have studied a number of common construction materials considered to be proton-free and find considerable proton impurity. We present results in terms of impurity proton spins per milligram and discuss procedures to minimize the effects of impurity signal.
authors.affiliation: Lyman Laboratory of Physics, Department of Physics, Harvard University, Cambridge, MA 02138, USA.
authors.forename: H Nathaniel
authors.initials: HN
authors.lastname: Bachman
authors.forename: Isaac F
authors.initials: IF
authors.lastname: Silvera
mesh_terms: D009682:Magnetic Resonance Spectroscopy; D011138:Polytetrafluoroethylene / Q000737:chemistry*; D014867:Water / Q000737:chemistry
chemical_list: D014867:Water; D011138:Polytetrafluoroethylene