Asymmetric Adiabatic Pulses for NH Selection

Tsang Lin Hwang, Peter C.M. Van Zijl, Michael Garwood

Research output: Contribution to journalEditorial

28 Citations (Scopus)

Abstract

Many types of NMR experiments demand the use of frequency-selective pulses to invert magnetization within discrete frequency limits. For certain experiments, only one side of the inversion band must be sharply demarcated, in which case this transition bandwidth can be narrowed when using an asymmetric adiabatic full passage. In the present study, a highly efficient asymmetric adiabatic full passage was created from a combination of two adiabatic half passages which used different modulation functions (HS1/2 and tanh/tan). Each adiabatic half passage occupied a different amount of time in the total pulse and performed one-half of the inversion. On one side, HS1/2 produced a sharp transition between inverted and noninverted states which was approximately 2.5 times narrower than the transition bandwidth afforded by a symmetric hyperbolic secant pulse of equal length. On the other side of the narrow transition band, the tanh/tan pulse achieved broadband inversion. These asymmetric pulses were applied to select NH groups immediately adjacent to the water signal in water-flip-back HSQC experiments using a double spin echo for the reverse INEPT step.

Original languageEnglish (US)
Pages (from-to)173-177
Number of pages5
JournalJournal of Magnetic Resonance
Volume138
Issue number1
DOIs
StatePublished - Jan 1 1999

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Water
pulses
Bandwidth
inversions
Experiments
Magnetization
bandwidth
Nuclear magnetic resonance
Modulation
water
echoes
broadband
modulation
magnetization
nuclear magnetic resonance

Keywords

  • Adiabatic full passage
  • Asymmetric pulses
  • Selective spin inversion

Cite this

Asymmetric Adiabatic Pulses for NH Selection. / Hwang, Tsang Lin; Van Zijl, Peter C.M.; Garwood, Michael.

In: Journal of Magnetic Resonance, Vol. 138, No. 1, 01.01.1999, p. 173-177.

Research output: Contribution to journalEditorial

Hwang, Tsang Lin ; Van Zijl, Peter C.M. ; Garwood, Michael. / Asymmetric Adiabatic Pulses for NH Selection. In: Journal of Magnetic Resonance. 1999 ; Vol. 138, No. 1. pp. 173-177.
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N2 - Many types of NMR experiments demand the use of frequency-selective pulses to invert magnetization within discrete frequency limits. For certain experiments, only one side of the inversion band must be sharply demarcated, in which case this transition bandwidth can be narrowed when using an asymmetric adiabatic full passage. In the present study, a highly efficient asymmetric adiabatic full passage was created from a combination of two adiabatic half passages which used different modulation functions (HS1/2 and tanh/tan). Each adiabatic half passage occupied a different amount of time in the total pulse and performed one-half of the inversion. On one side, HS1/2 produced a sharp transition between inverted and noninverted states which was approximately 2.5 times narrower than the transition bandwidth afforded by a symmetric hyperbolic secant pulse of equal length. On the other side of the narrow transition band, the tanh/tan pulse achieved broadband inversion. These asymmetric pulses were applied to select NH groups immediately adjacent to the water signal in water-flip-back HSQC experiments using a double spin echo for the reverse INEPT step.

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