Novel pulse sequences for time-resolved photo-CIDNP
Novel pulse sequences for time-resolved photo-CIDNP
The properties of a new class of pulse sequences for photo-CIDNP (photochemically induced dynamic nuclear polarization) are analysed in detail, and guidelines for their optimization and applicability are derived. Sensitivity is a central problem with time-resolved photo-CIDNP experiments. By using multiple laser flashes per acquisition and storing the polarizations temporarily in the spin system, a significant improvement is achieved. An alternative application is the reduction of the absorbed light needed to attain a given sensitivity. Compared to conventional signal averaging with the same number n of flashes, a maximum additional improvement by a factor of slightly more than 0.5?n can be achieved in both cases. By an analysis of the transfer pathways, it is shown that multiplet signals and CIDNP multiplet effects can also be investigated in this way, even for strongly coupled spin systems. Experimental examples are given.
chemically induced dynamic nuclear polarization, nmr spectroscopy, pulse sequences, laser methods, spin chemistry
1675-1686
Goez, Martin
13b3cf30-8a51-44fd-b249-09642abfd8f9
Kuprov, I.
bb07f28a-5038-4524-8146-e3fc8344c065
Hun Mok, K.
12b720bf-a843-4784-81b1-e01e9c231d1d
Hore, P.J.
cad4561e-9571-4b49-b633-1c0bb470d144
2006
Goez, Martin
13b3cf30-8a51-44fd-b249-09642abfd8f9
Kuprov, I.
bb07f28a-5038-4524-8146-e3fc8344c065
Hun Mok, K.
12b720bf-a843-4784-81b1-e01e9c231d1d
Hore, P.J.
cad4561e-9571-4b49-b633-1c0bb470d144
Goez, Martin, Kuprov, I., Hun Mok, K. and Hore, P.J.
(2006)
Novel pulse sequences for time-resolved photo-CIDNP.
[in special issue: in honour of Professor Keith McLauchlan]
Molecular Physics, 104 (10-11), .
(doi:10.1080/00268970600634431).
Abstract
The properties of a new class of pulse sequences for photo-CIDNP (photochemically induced dynamic nuclear polarization) are analysed in detail, and guidelines for their optimization and applicability are derived. Sensitivity is a central problem with time-resolved photo-CIDNP experiments. By using multiple laser flashes per acquisition and storing the polarizations temporarily in the spin system, a significant improvement is achieved. An alternative application is the reduction of the absorbed light needed to attain a given sensitivity. Compared to conventional signal averaging with the same number n of flashes, a maximum additional improvement by a factor of slightly more than 0.5?n can be achieved in both cases. By an analysis of the transfer pathways, it is shown that multiplet signals and CIDNP multiplet effects can also be investigated in this way, even for strongly coupled spin systems. Experimental examples are given.
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Published date: 2006
Keywords:
chemically induced dynamic nuclear polarization, nmr spectroscopy, pulse sequences, laser methods, spin chemistry
Organisations:
Computational Systems Chemistry
Identifiers
Local EPrints ID: 347389
URI: http://eprints.soton.ac.uk/id/eprint/347389
ISSN: 0026-8976
PURE UUID: e5e90ed5-486f-4722-8b73-64eca0a8b902
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Date deposited: 27 Feb 2013 12:04
Last modified: 15 Mar 2024 03:43
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Contributors
Author:
Martin Goez
Author:
K. Hun Mok
Author:
P.J. Hore
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