NMR Excitation, Dephasing and Spin Echoes

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[NMR tweet] Nuclear Magnetic Resonance and the Measurement of Spin-Spin ... http://bit.ly/fUIfX1 Nuclear Magnetic Resonance and the Measurement of Spin-Spin ... http://bit.ly/fUIfX1 Published by huvzcom (huvz.com) on 2011-04-26T03:16:29Z Source: Twitter	nmrlearner	Twitter NMR	0	04-26-2011 03:31 AM
[U. of Ottawa NMR Facility Blog] Excitation Profiles for Shaped Pulses Excitation Profiles for Shaped Pulses Shaped pulses are very commonly used for selective excitation and nonselective inversion in a large number of NMR pulse sequences. The frequency domain excitation profile of a radio frequency pulse is the Fourier transform of the time dependent pulse shape and determines the width, uniformity and phase of the frequency spectrum excited. Since time and frequency are reciprocals of one another, short rf pulses have very wide excitation profiles and long rf pulses have very narrow selective excitation profiles. In a previous BLOG post the excitation...	nmrlearner	News from NMR blogs	0	01-21-2011 02:31 AM
[NMR paper] Transverse dephasing optimized solid-state NMR spectroscopy. Transverse dephasing optimized solid-state NMR spectroscopy. Related Articles Transverse dephasing optimized solid-state NMR spectroscopy. J Am Chem Soc. 2003 Nov 19;125(46):13938-9 Authors: De Paëpe G, Giraud N, Lesage A, Hodgkinson P, Böckmann A, Emsley L It is shown how coherence lifetimes in solid-state NMR experiments can be controlled. New decoupling schemes are introduced which actively optimize dephasing times, providing increases of up to a factor of 2 with respect to the best existing schemes. The new schemes are implemented in...	nmrlearner	Journal club	0	11-24-2010 08:16 PM
[U. of Ottawa NMR Facility Blog] Gradient Spin Echoes for Selective Excitation Gradient Spin Echoes for Selective Excitation Shaped excitation pulses can replace the non-selective hard pulses typically used in a one-pulse measurement to achieve selective excitation. Another method of achieving selective excitation is the gradient spin echo using a selective 180° pulse. This technique is demonstrated in the figure below. http://4.bp.blogspot.com/_5wBTR2kKTqA/S_UxeG5oXdI/AAAAAAAAAzc/BHWef-Tse7s/s400/grad_spin_echo.jpgA non-selective hard 90°x pulse is first given followed by a pair of identical pulsed field gradients sandwiching a soft selective 180° pulse about the y...	nmrlearner	News from NMR blogs	0	08-21-2010 08:15 PM
[U. of Ottawa NMR Facility Blog] The Dephasing Power of Pulsed Field Gradients The Dephasing Power of Pulsed Field Gradients Pulsed field gradients are used in many modern NMR measurements to select specific coherence pathways and eliminate (or at least minimize) the need for time consuming pulse and receiver phase cycles. The gradients are most often used in conjunction with spin echos such that unwanted coherences can be dephased and the desired coherences can be rephased. They are also used to measure diffusion constants or collect DOSY data. It is instructive to examine the magnetization vectors in the active volume of an NMR tube as a function of the gradient...	nmrlearner	News from NMR blogs	0	08-21-2010 08:15 PM
[Stan NMR blog] Field noise effects on NMR signals: Hahn echoes and CPMG Field noise effects on NMR signals: Hahn echoes and CPMG An article about the effects of field noise on spin echoes and CPMG decays. More...	nmrlearner	News from NMR blogs	0	08-21-2010 06:14 PM
Introductory NMR & MRI: Video 06: Spin echoes, CPMG and T2 relaxation Introductory NMR & MRI: Video 06: Spin echoes, CPMG and T2 relaxation http://i.ytimg.com/vi/B2HMAJQJ7ok/default.jpg Introductory NMR & MRI: Video 06: Spin echoes, CPMG and T2 relaxation Paul Callaghan gives an introduction to NMR and MRI. This is the 6th video of a 10 episode series produced by Magritek Ltd. From: magritek Views: 7207 http://gdata.youtube.com/static/images/icn_star_full_11x11.gif http://gdata.youtube.com/static/images/icn_star_full_11x11.gif http://gdata.youtube.com/static/images/icn_star_full_11x11.gif...	nmrlearner	NMR educational videos	0	08-18-2010 01:38 AM
dipolar dephasing and T2 is dipolar dephasing one of the contributing mechanisms to T2 or they are different ? Thanks	wqsm	NMR Questions and Answers	0	08-10-2006 10:20 PM

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