Creating Long-Lived Spin States at Variable Magnetic Field by Means of Photochemically Induced Dynamic Nuclear Polarization.
We have shown that long-lived spin states (LLS) can be selectively populated by photogenerated chemically induced dynamic nuclear polarization (CIDNP) over a wide range of magnetic fields. Relaxation times of LLS of the β-CH2 protons in N-acetyl histidine and partially deuterated histidine have been measured. Our experiments demonstrate that CIDNP enables creating LLS in the amino acid in a field range of up to a few Tesla and that their lifetimes can be 45 times longer than T1. The advantage of the method is thus two-fold: it allows one to accumulate high levels of spin hyperpolarization and to preserve them for periods of time far exceeding T1. Therefore, photo-CIDNP is a technique suitable for creating long-lived spin order in biologically relevant molecules.
†Institute of Experimental Physics, Freie Universität Berlin, Arnimallee14, D-14195 Berlin, Germany.|‡International Tomography Center, Institutskaya 3a, 630090, Novosibirsk, Russia.
Alexey S
AS
Kiryutin
†Institute of Experimental Physics, Freie Universität Berlin, Arnimallee14, D-14195 Berlin, Germany.|§Physikalisch-Technische Bundesanstalt, Abbestr. 2-12, D-10587 Berlin, Germany.
Sergey E
SE
Korchak
‡International Tomography Center, Institutskaya 3a, 630090, Novosibirsk, Russia.|∥Novosibirsk State University, Pirogova 2, 630090, Novosibirsk, Russia.
Konstantin L
KL
Ivanov
‡International Tomography Center, Institutskaya 3a, 630090, Novosibirsk, Russia.|∥Novosibirsk State University, Pirogova 2, 630090, Novosibirsk, Russia.
Alexandra V
AV
Yurkovskaya
†Institute of Experimental Physics, Freie Universität Berlin, Arnimallee14, D-14195 Berlin, Germany.
Hans-Martin
HM
Vieth
NMR; hyperpolarization; long-lived spin states; photo-CIDNP