title: Implementing SPAM into STMAS: a net sensitivity improvement in high-resolution NMR of quadrupolar nuclei.
abstract: Gan and Kwak recently introduced two new tools for high-resolution 2D NMR methods applied to quadrupolar nuclei: double-quantum filtering in STMAS (DQF-STMAS) and the soft-pulse added mixing (SPAM) idea. Double-quantum filtering suppresses all undesired signals in the STMAS method with limited loss in sensitivity. With SPAM, all pathways are added constructively after the second hard-pulse instead of using a single pathway as previously. Here, the sensitivity, advantages and drawbacks of DQF-STMAS are compared to 3QMAS. Additionally, SPAM can be included into DQF-STMAS method, resulting in a net sensitivity gain with respect to 3QMAS of ca. 10-15.
authors.affiliation: LCPS, CNRS-8012, ENSCL-USTL, Fr-59652 Villeneuve d'Ascq, France. jean-paul.amoureux@univ-lille1.fr
authors.forename: J P
authors.initials: JP
authors.lastname: Amoureux
authors.forename: L
authors.initials: L
authors.lastname: Delevoye
authors.forename: G
authors.initials: G
authors.lastname: Fink
authors.forename: F
authors.initials: F
authors.lastname: Taulelle
authors.forename: A
authors.initials: A
authors.lastname: Flambard
authors.forename: L
authors.initials: L
authors.lastname: Montagne