TY - JOUR
T1 - Theoretical Study of Dipolar Relaxation of Coupled Nuclear Spins at Variable Magnetic Field
AU - Pravdivtsev, A.N.
AU - Ivanov, K.L.
AU - Kaptein, R.
AU - Yurkovskaya, A.V.
PY - 2013
Y1 - 2013
N2 - A theoretical study was made of magnetic field-dependent dipolar
relaxation in two- and three-spin systems. The results for the nuclear magnetic
relaxation dispersion (NMRD) curves were compared with those for the simpler
model of fluctuating local fields. For both models it was found that at low fields
spins tend to relax with a common T1-relaxation time. Sharp features in the NMRD
curves coming from nuclear spin level anti-crossings are also predicted by both
models. However, the simple model fails to describe the behavior of so-called longlived
spin states (LLS). We have studied the LLS as function of magnetic field and
molecular geometry and simulated experimental results for the LLS in histidine
amino acid obtained at the laboratory of Prof. H.-M. Vieth (Free University Berlin,
Germany). In addition, we described polarization transfer in a three-spin system
where two spins are protons, which are initially hyperpolarized by para-hydrogen
induced polarization (PHIP), while the third spin is a spin hetero-nucleus, which
acquires polarization in the course of cross-relaxation.
AB - A theoretical study was made of magnetic field-dependent dipolar
relaxation in two- and three-spin systems. The results for the nuclear magnetic
relaxation dispersion (NMRD) curves were compared with those for the simpler
model of fluctuating local fields. For both models it was found that at low fields
spins tend to relax with a common T1-relaxation time. Sharp features in the NMRD
curves coming from nuclear spin level anti-crossings are also predicted by both
models. However, the simple model fails to describe the behavior of so-called longlived
spin states (LLS). We have studied the LLS as function of magnetic field and
molecular geometry and simulated experimental results for the LLS in histidine
amino acid obtained at the laboratory of Prof. H.-M. Vieth (Free University Berlin,
Germany). In addition, we described polarization transfer in a three-spin system
where two spins are protons, which are initially hyperpolarized by para-hydrogen
induced polarization (PHIP), while the third spin is a spin hetero-nucleus, which
acquires polarization in the course of cross-relaxation.
U2 - 10.1007/s00723-012-0404-z
DO - 10.1007/s00723-012-0404-z
M3 - Article
SN - 0937-9347
VL - 44
SP - 23
EP - 39
JO - Applied Magnetic Resonance
JF - Applied Magnetic Resonance
ER -