title: Double-quantum NMR spectroscopy based on finite pulse RFDR.
abstract: We demonstrate that the finite pulse RFDR sequence (J. Chem. Phys. 114 (2001) 8473) can be used effectively for 31P double-quantum NMR spectroscopy at a spinning frequency of 10 kHz. The 31P NMR data measured for hydroxyapatite and octacalcium phosphate show that sizable double-quantum excitation efficiency can be obtained with the ratio of the recoupling field to spinning frequency set equal to 1.67.
authors.affiliation: Department of Chemistry, National Taiwan University, College of Science, No. 1, Section 4, Roosevelt Road, Taipei 10617, Taiwan.
authors.forename: Yao-Hung
authors.initials: YH
authors.lastname: Tseng
authors.forename: Yun
authors.initials: Y
authors.lastname: Mou
authors.forename: Chung-Yuan
authors.initials: CY
authors.lastname: Mou
authors.forename: Jerry C C
authors.initials: JC
authors.lastname: Chan