Increasing the sensitivity of time-resolved photo-CIDNP experiments by multiple laser flashes and temporary storage in the rotating frame
Increasing the sensitivity of time-resolved photo-CIDNP experiments by multiple laser flashes and temporary storage in the rotating frame
Pulse sequences have been developed that add up time-resolved photo-CIDNP signals from n successive laser flashes not in the acquisition computer of the NMR spectrometer but in the experiment itself, resulting in a greatly improved signal-to-noise ratio. For this accumulation, CIDNP is first stored in the transverse plane and then on the z axis, and finally superimposed on CIDNP produced by the next flash. These storage cycles also result in a very efficient background suppression. Because only one free induction decay is acquired for n flashes, the noise is digitized only once. The signal gain is demonstrated experimentally and analyzed theoretically. Losses are mostly due to nuclear spin relaxation, and to a small extent to instrument imperfections. With 10 laser flashes, a signal increase by a factor of about 7.5 was realized. As their main advantage compared to signal averaging in the usual way, these sequences yield the same signal-to-noise ratio with fewer laser flashes; the theoretical improvement is by a factor of √n.
chemically induced dynamic nuclear polarization, pulse sequences, signal-to-noise ratio, laser methods, photoinduced electron transfer
139-145
Goez, Martin
13b3cf30-8a51-44fd-b249-09642abfd8f9
Kuprov, Ilya
bb07f28a-5038-4524-8146-e3fc8344c065
Hore, P.J.
cad4561e-9571-4b49-b633-1c0bb470d144
November 2005
Goez, Martin
13b3cf30-8a51-44fd-b249-09642abfd8f9
Kuprov, Ilya
bb07f28a-5038-4524-8146-e3fc8344c065
Hore, P.J.
cad4561e-9571-4b49-b633-1c0bb470d144
Goez, Martin, Kuprov, Ilya and Hore, P.J.
(2005)
Increasing the sensitivity of time-resolved photo-CIDNP experiments by multiple laser flashes and temporary storage in the rotating frame.
Journal of Magnetic Resonance, 177 (1), .
(doi:10.1016/j.jmr.2005.06.017).
Abstract
Pulse sequences have been developed that add up time-resolved photo-CIDNP signals from n successive laser flashes not in the acquisition computer of the NMR spectrometer but in the experiment itself, resulting in a greatly improved signal-to-noise ratio. For this accumulation, CIDNP is first stored in the transverse plane and then on the z axis, and finally superimposed on CIDNP produced by the next flash. These storage cycles also result in a very efficient background suppression. Because only one free induction decay is acquired for n flashes, the noise is digitized only once. The signal gain is demonstrated experimentally and analyzed theoretically. Losses are mostly due to nuclear spin relaxation, and to a small extent to instrument imperfections. With 10 laser flashes, a signal increase by a factor of about 7.5 was realized. As their main advantage compared to signal averaging in the usual way, these sequences yield the same signal-to-noise ratio with fewer laser flashes; the theoretical improvement is by a factor of √n.
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Published date: November 2005
Keywords:
chemically induced dynamic nuclear polarization, pulse sequences, signal-to-noise ratio, laser methods, photoinduced electron transfer
Organisations:
Computational Systems Chemistry
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Local EPrints ID: 347394
URI: http://eprints.soton.ac.uk/id/eprint/347394
PURE UUID: 03d4d063-2f65-4af4-8fa0-507bfccf76f9
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Date deposited: 27 Feb 2013 12:26
Last modified: 15 Mar 2024 03:43
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Author:
Martin Goez
Author:
P.J. Hore
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