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An Optical Method for Orienting the Spinning Axis in an NMR Experiment

IP.com Disclosure Number: IPCOM000044855D
Original Publication Date: 1984-Nov-01
Included in the Prior Art Database: 2005-Feb-06
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Kendrick, RD: AUTHOR [+3]

Abstract

A method for orienting or aligning the spinning axis in an NMR experiment involves forming an image of the top or sides of the probe rotor by shining a laser down the tube bore so that it strikes a mirror. The image of the spinning rotor that is formed is calibrated against a reference image for a rotor known to be spinning at the magic angle.

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An Optical Method for Orienting the Spinning Axis in an NMR Experiment

A method for orienting or aligning the spinning axis in an NMR experiment involves forming an image of the top or sides of the probe rotor by shining a laser down the tube bore so that it strikes a mirror. The image of the spinning rotor that is formed is calibrated against a reference image for a rotor known to be spinning at the magic angle.

A top view of the optical system l0 employing this method is shown in the drawing. A laser l2 passes a beam l4 through beam expansion optical means l6 into the probe body l8. The beam l4 goes past the rotor 20 and strikes the mirror
22. The beam 24 reflected from the mirror 22 passes to the beam splitter 26 which directs the reflected beam 24 through a lens 28 to the image plane 30. Changes of the order of one-half (1/4) degree optically are obtained. Sensitivity of this degree results in a reduction of a non-spinning linewidth by a factor of about l00.

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