sensitivity_enhancement_10

sensitivity_enhancement_10 - Sensitivity Enhancement and...

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Sensitivity Enhancement and Fast NMR BCMB 8190
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References T. Maly, G.T. Debelouchina, V.S. Bajaj, K-N. Hu, C-G. Joo, M.L. Mak–Jurkauskas, J.R. Sirigiri, P.C.A. van der Wel, J. Herzfeld, R.J. Temkin, and R.G. Griffin. (2008). Dynamic nuclear polarization at high magnetic fields. J. Chem. Phys . 128:52211-19. B.M. Goodson. (2002) Advances in Magnetic Resonance: Nuclear Magnetic Resonance of Laser- Polarized Noble Gases in Molecules, Materials, and Organisms. J. Mag. Reson. 155:157–216. Title: Principles and Progress in Ultrafast Multidimensional Nuclear Magnetic Resonance M. Mishkovsky and L. Frydman. (2000) Principles and progress in multidimensional NMR. Ann. Rev. Phys. Chem. 60:429-448
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Sensitivity Enhancement: Where can you Get It? • Better detection: cryo-probes, SQUIDS, mechanical oscillators • Higher magnetic fields: 23.4T (1.0 GHz) • Higher polarization: low temp, transfer from systems with higher γ , pumping For S=1/2 detection with a coil at low polarization: Signal = γ 3 B 0 2 h 2 / (16 π 2 kT) P = γ B 0 h/(4 π kT)
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Alkali Metal Spin Exchange From: B.M. Goodson (2002) J. Mag. Reson. 155:157–216. Depends on the use of circularly polarized light and the conservation of angular momentum
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Experimental Set-up: Optical Pumping and Spin Exchange of Alkali Metal 2) Circularly polarized laser light applied. λ = 794.8 nm, 5s to 5p (D1) transition of Rb 1) 129 Xe (or 3 He) at low pressure (~ 8 atm ) is enclosed in a cylindrical glass chamber in a low magnetic field (~ 10 G). Trace amounts of Rb added, heated to 200°C. 3)
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This note was uploaded on 11/07/2011 for the course CHEM 8853R taught by Professor Gelbaum during the Fall '11 term at Georgia Tech.

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sensitivity_enhancement_10 - Sensitivity Enhancement and...

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