Broadband Excitation by Method of Double Sweep
- Autores: Khaneja N.1, Kumar A.2
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Afiliações:
- Department of Electrical Engineering, IIT Bombay
- Department of Biosciences and Bioengineering, IIT Bombay
- Edição: Volume 48, Nº 8 (2017)
- Páginas: 771-782
- Seção: Original Paper
- URL: https://journals.rcsi.science/0937-9347/article/view/247752
- DOI: https://doi.org/10.1007/s00723-017-0894-9
- ID: 247752
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Resumo
The paper describes the design of broadband excitation pulses in high resolution nuclear magnetic resonance (NMR) by method of double sweep. We first show the design of a pulse sequence that produces broadband excitation to the equator of Bloch sphere with phase linearly dispersed as frequency. We show how this linear dispersion can then be refocused by nesting free evolution between two adiabatic inversions (sweeps). We then show how this construction can be generalized to exciting arbitrary large bandwidths without increasing the peak rf-amplitude and by incorporating more adiabatic sweeps. Finally, we show how the basic design can then be modified to give a broadband x rotation over arbitrary large bandwidth and with limited rf-amplitude. Experimental excitation profiles for the residual HDO signal in a sample of \(99.5\%\) D\(_2\)0 are displayed as a function of resonance offset. Application of the excitation is shown for \(^{13}\)C excitation in a labelled sample of alanine.
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Sobre autores
Navin Khaneja
Department of Electrical Engineering, IIT Bombay
Autor responsável pela correspondência
Email: navinkhaneja@gmail.com
ORCID ID: 0000-0003-4025-5393
Índia, Powai, 400076
Ashutosh Kumar
Department of Biosciences and Bioengineering, IIT Bombay
Email: navinkhaneja@gmail.com
Índia, Powai, 400076