title: Sources of sensitivity losses in ultrafast 2D NMR.
abstract: Recent ultrafast techniques make it possible to obtain nD NMR spectra in a single scan. However, an important sensitivity decrease is observed when the excitation duration is increased, which is necessary to improve resolution. A detailed, theoretical and experimental study of sensitivity losses in ultrafast experiments is carried out on the example of J-resolved spectroscopy. The importance of molecular diffusion effects during both encoding and acquisition phases is shown by numerical simulations and experimental results. Other possible sources of signal-to-noise decrease are also considered, such as transverse relaxation, homonuclear J-couplings or chemical shift effects.
authors.affiliation: Université de Nantes, Nantes Atlantique Universités, CNRS, Laboratoire d'Analyse Isotopique et Electrochimique de Métabolismes, UMR 6006, Faculté des Sciences, B.P. 92208, Nantes Cedex 03, France. patrick.giraudeau@univ-nantes.fr
authors.forename: Patrick
authors.initials: P
authors.lastname: Giraudeau
authors.forename: Serge
authors.initials: S
authors.lastname: Akoka