Simultaneous and Independent Rotations with Arbitrary Flip Angles and Phases for I, ISα, and ISβSpin Systems

✍ Scribed by Jacques Briand; Ole W. Sørensen

• Publisher: Elsevier Science
• Year: 1998
• Tongue: English
• Weight: 165 KB
• Volume: 135
• Category: Article
• ISSN: 1090-7807
• DOI: 10.1006/jmre.1998.1556

✦ Synopsis

A new pulse sequence element for simultaneous and independent rotations with arbitrary flip angles and phases for isolated I, IS ␣ , and IS ␤ resonances without the use of selective radiofrequency pulses is introduced and experimentally demonstrated. S is a directly attached heteronucleus either at natural abundance or isotopically enriched. This pulse sequence element, dubbed TIG-BIRD (triselective independent gyrations BIRD), generalizes earlier elements like BIRD, TANGO, BANGO, and BIG-BIRD, the latter of which allows for arbitrary selection of flip angles and phases for I and IS spin systems without discriminating between IS ␣ and IS ␤ resonances. For IS ␣ and IS ␤ spin systems it also generalizes the spin-state-selective excitation (S 3 E) element selectively exciting only one of the IS ␣ or IS ␤ resonances. TIG-BIRD is a nonselective addition to the NMR toolkit which effects the equivalent of three independent selective rotations for I, IS ␣ , and IS ␤ resonances.