Berry, M. V.: Quantal Phase Factors Accompanying Adiabatic Changes, P.
R. Soc. A, 392, 45–57, 1984.
Bowers, C. R. and Weitekamp, D. P.: Parahydrogen and synthesis allow
dramatically enhanced nuclear alignment, J. Am. Chem. Soc., 109, 5541–5542,
https://doi.org/10.1021/ja00252a049, 1987.
Buratto, R., Mammoli, D., Chiarparin, E., Williams, G., and Bodenhausen, G.:
Exploring Weak Ligand-Protein Interactions by Long-Lived NMR States:
Improved Contrast in Fragment-Based Drug Screening, Angew. Chem. Int. Edit.,
53, 11376–11380, https://doi.org/10.1002/anie.201404921, 2014.
Carravetta, M., Johannessen, O. G., and Levitt, M. H.: Beyond the T1 limit:
singlet nuclear spin states in low magnetic fields, Phys. Rev. Lett., 92,
153003, https://doi.org/10.1103/PhysRevLett.92.153003, 2004.
DeVience, S. J., Walsworth, R. L., and Rosen, M. S.: Preparation of Nuclear
Spin Singlet States Using Spin-Lock Induced Crossing, Phys. Rev. Lett., 111,
173002, https://doi.org/10.1103/PhysRevLett.111.173002, 2013.
Duckett, S. B. and Mewis, R. E.: Application of parahydrogen induced
polarization techniques in NMR spectroscopy and imaging, Acc. Chem. Res.,
45, 1247–1257, https://doi.org/10.1021/ar2003094, 2012.
Eills, J., Blanchard, J. W., Wu, T., Bengs, C., Hollenbach, J., Budker, D.,
and Levitt, M. H.: Polarization transfer via field sweeping in
parahydrogen-enhanced nuclear magnetic resonance, J. Chem. Phys., 150,
174202, https://doi.org/10.1063/1.5089486, 2019.
Franzoni, M. B., Buljubasich, L., Spiess, H. W., and Münnemann, K.:
Long-Lived 1H Singlet Spin States Originating from Para-Hydrogen in
Cs-Symmetric Molecules Stored for Minutes in High Magnetic Fields, J. Am.
Chem. Soc., 134, 10393–10396, https://doi.org/10.1021/Ja304285s, 2012.
Franzoni, M. B., Graafen, D., Buljubasich, L., Schreiber, L. M., Spiess, H.
W., and Münnemann, K.: Hyperpolarized H-1 long lived states originating
from parahydrogen accessed by rf irradiation, Phys. Chem. Chem. Phys., 15,
17233–17239, https://doi.org/10.1039/C3cp52029c, 2013.
Freeman, R.: Spin Choreography: Basic Steps in High Resolution NMR, Oxford
University Press, Oxford, UK, 1998.
Green, R. A., Adams, R. W., Duckett, S. B., Mewis, R. E., Williamson, D. C.,
and Green, G. G. R.: The theory and practice of hyperpolarization in
magnetic resonance using parahydrogen, Prog. Nucl. Mag. Res. Sp.,
67, 1–48, https://doi.org/10.1016/j.pnmrs.2012.03.001, 2012.
Hediger, S., Meier, B. H., Kurur, N. D., Bodenhausen, G., and Ernst, R. R.:
NMR Cross-Polarization by Adiabatic Passage through the Hartmann-Hahn
Condition (APHH), Chem. Phys. Lett., 223, 283–288,
https://doi.org/10.1016/0009-2614(94)00470-6, 1994.
Ivanov, K. L., Pravdivtsev, A. N., Yurkovskaya, A. V., Vieth, H.-M., and
Kaptein, R.: The role of level anti-crossings in nuclear spin
hyperpolarization, Prog. Nucl. Mag. Res. Sp., 81, 1–36,
https://doi.org/10.1016/j.pnmrs.2014.06.001, 2014.
Kiryutin, A. S., Panov, M. S., Yurkovskaya, A. V., Ivanov, K. L., and
Bodenhausen, G.: Proton relaxometry of long-lived spin order, ChemPhysChem.,
20, 766–772, https://doi.org/10.1002/cphc.201800960, 2019.
Knecht, S., Kiryutin, A. S., Yurkovskaya, A. V., and Ivanov, K. L.:
Efficient conversion of anti-phase spin order of protons into 15N
magnetisation using SLIC-SABRE, Mol. Phys., 2018, 1–10,
https://doi.org/10.1080/00268976.2018.1515999, 2018.
Levitt, M. H.: Singlet Nuclear Magnetic Resonance, in: Annu. Rev. Phys.
Chem., Annual Reviews, edited by: Johnson, M. A. and Martinez, T. J., Palo Alto, 89–105, 2012.
Levitt, M. H.: Long live the singlet state!, J. Magn. Reson., 306, 69–74,
https://doi.org/10.1016/j.jmr.2019.07.029, 2019.
Lukzen, N. N. and Steiner, U. E.: Adiabatic Transfer of Net Electron
Polarization to Nuclear-Polarization, Mol. Phys., 86, 1271–1282,
https://doi.org/10.1080/00268979500102721, 1995.
Mentink-Vigier, F., Akbey, Ü., Oschkinat, H., Vega, S., and Feintuch,
A.: Theoretical aspects of Magic Angle Spinning – Dynamic Nuclear
Polarization, J. Magn. Reson., 258, 102–120,
https://doi.org/10.1016/j.jmr.2015.07.001, 2015.
Miesel, K., Ivanov, K. L., Yurkovskaya, A. V., and Vieth, H.-M.: Coherence
transfer during field-cycling NMR experiments, Chem. Phys. Lett., 425,
71–76, https://doi.org/10.1016/j.cplett.2006.05.025, 2006.
Natterer, J. and Bargon, J.: Parahydrogen induced polarization, Prog. Nucl. Mag. Res. Sp., 31, 293–315, https://doi.org/10.1016/S0079-6565(97)00007-1, 1997.
Pileio, G.: Relaxation theory of nuclear singlet states in two spin-1/2
systems, Prog. Nucl. Mag. Res. Sp., 56, 217–231,
https://doi.org/10.1016/j.pnmrs.2009.10.001, 2010.
Pileio, G.: Singlet NMR methodology in two-spin-1/2 systems, Prog. Nucl. Mag. Res. Sp., 98–99, 1–19, https://doi.org/10.1016/j.pnmrs.2016.11.002, 2017.
Pines, A., Gibby, M. G., and Waugh, J. S.: Proton-Enhanced Nuclear Induction
Spectroscopy. A Method for High Resolution NMR of Dilute Spins in Solids, J.
Chem. Phys., 56, 1776–1777, https://doi.org/10.1063/1.1677439, 1972.
Pravdivtsev, A. N., Yurkovskaya, A. V., Kaptein, R., Miesel, K., Vieth,
H.-M., and Ivanov, K. L.: Exploiting level anti-crossings for efficient and
selective transfer of hyperpolarization in coupled nuclear spin systems,
Phys. Chem. Chem. Phys., 15, 14660–14669, https://doi.org/10.1039/c3cp52026a, 2013a.
Pravdivtsev, A. N., Yurkovskaya, A. V., Vieth, H.-M., Ivanov, K. L., and
Kaptein, R.: Level Anti-Crossings are a Key Factor for Understanding
para-Hydrogen-Induced Hyperpolarization in SABRE Experiments, ChemPhysChem,
14, 3327–3331, https://doi.org/10.1002/cphc.201300595, 2013b.
Pravdivtsev, A. N., Yurkovskaya, A. V., Lukzen, N. N., Ivanov, K. L., and
Vieth, H. M.: Highly Efficient Polarization of Spin-1/2 Insensitive NMR
Nuclei by Adiabatic Passage through Level Anticrossings, J. Phys. Chem.
Lett., 5, 3421–3426, https://doi.org/10.1021/Jz501754j, 2014a.
Pravdivtsev, A. N., Yurkovskaya, A. V., Lukzen, N. N., Vieth, H. M., and
Ivanov, K. L.: Exploiting level anti-crossings (LACs) in the rotating frame
for transferring spin hyperpolarization, Phys. Chem. Chem. Phys., 16,
18707–18719, https://doi.org/10.1039/C4cp01445f, 2014b.
Pravdivtsev, A. N., Yurkovskaya, A. V., Vieth, H. M., and Ivanov, K. L.:
Spin mixing at level anti-crossings in the rotating frame makes high-field
SABRE feasible, Phys. Chem. Chem. Phys., 16, 24672-24675,
https://doi.org/10.1039/C4cp03765k, 2014c.
Pravdivtsev, A. N., Kiryutin, A. S., Yurkovskaya, A. V., Vieth, H.-M., and
Ivanov, K. L.: Robust conversion of singlet spin order in coupled spin-1/2
pairs by adiabatically ramped RF-fields, J. Magn. Reson., 273, 56–64,
https://doi.org/10.1016/j.jmr.2016.10.003, 2016.
Pravica, M. G. and Weitekamp, D. P.: Net NMR Alignment by Adiabatic
Transport of Parahydrogen Addition Products to High Magnetic Field, Chem.
Phys. Lett., 145, 255–258, https://doi.org/10.1016/0009-2614(88)80002-2, 1988.
Rodin, B. A., Kiryutin, A. S., Yurkovskaya, A. V., Ivanov, K. L., Yamamoto,
S., Sato, K., and Takui, T.: Using optimal control methods with constraints
to generate singlet states in NMR, J. Magn. Reson., 291, 14–22,
https://doi.org/10.1016/j.jmr.2018.03.005, 2018.
Rodin, B. A., Sheberstov, K. F., Kiryutin, A. S., Hill-Cousins, J. T.,
Brown, L. J., Brown, R. C. D., Jamain, B., Zimmermann, H., Sagdeev, R. Z.,
Yurkovskaya, A. V., and Ivanov, K. L.: Constant-adiabaticity RF-pulses for
generating long-lived singlet spin states in NMR, J. Chem. Phys., 150,
064201, https://doi.org/10.1063/1.5079436, 2019.
Rodin, B. A., Bengs, C., Kiryutin, A. S., Sheberstov, K. F., Brown, L. J.,
Brown, R. C. D., Yurkovskaya, A. V., Ivanov, K. L., and Levitt, M. H.:
Algorithmic cooling of nuclear spins using long-lived singlet order, J.
Chem. Phys., 152, 164201, https://doi.org/10.1063/5.0006742, 2020.
Sheberstov, K. F., Vieth, H. M., Zimmermann, H., Rodin, B. A., Ivanov, K.
L., Kiryutin, A. S., and Yurkovskaya, A. V.: Generating and sustaining
long-lived spin states in N-15,N-15'-azobenzene, Sci. Rep.-UK, 9, 20161,
https://doi.org/10.1038/s41598-019-56734-y, 2019.
Stevanato, G., Hill-Cousins, J. T., Hakansson, P., Roy, S. S., Brown, L. J.,
Brown, R. C. D., Pileio, G., and Levitt, M. H.: A Nuclear Singlet Lifetime
of More than One Hour in Room-Temperature Solution, Angew. Chem. Int. Edit.,
54, 3740–3743, https://doi.org/10.1002/anie.201411978, 2015.
Theis, T., Feng, Y., Wu, T., and Warren, W. S.: Composite and shaped pulses
for efficient and robust pumping of disconnected eigenstates in magnetic
resonance, J. Chem. Phys., 140, 014201, https://doi.org/10.1063/1.4851337, 2014a.
Theis, T., Truong, M., Coffey, A. M., Chekmenev, E. Y., and Warren, W. S.:
LIGHT-SABRE enables efficient in-magnet catalytic hyperpolarization, J.
Magn. Reson., 248, 23–26, https://doi.org/10.1016/j.jmr.2014.09.005, 2014b.
Theis, T., Ariyasingha, N. M., Shchepin, R. V., Lindale, J. R., Warren, W.
S., and Chekmenev, E. Y.: Quasi-Resonance Signal Amplification by Reversible
Exchange, J. Phys. Chem. Lett., 9, 6136–6142, https://doi.org/10.1021/acs.jpclett.8b02669, 2018.
Thurber, K. R. and Tycko, R.: Theory for cross effect dynamic nuclear
polarization under magic-angle spinning in solid state nuclear magnetic
resonance: The importance of level crossings, J. Chem. Phys., 137, 084508, https://doi.org/10.1063/1.4747449, 2012.
Thurber, K. R. and Tycko, R.: On Mechanisms of Dynamic Nuclear Polarization
in Solids, Isr. J. Chem., 54, 39–46, https://doi.org/10.1002/ijch.201300116, 2014.
Vasos, P. R., Comment, A., Sarkar, R., Ahuja, P., Jannin, S., Ansermet, J.
P., Konter, J. A., Hautle, P., Van Den Brandt, B., and Bodenhausen, G.:
Long-lived states to sustain hyperpolarized magnetization, P. Natl. Acad.
Sci. USA, 106, 18469-18473, https://doi.org/10.1073/pnas.0908123106, 2009.
Vega, A. J.: MAS NMR spin locking of half-integer quadrupolar nuclei,
J. Magn. Reson., 96, 50–68, https://doi.org/10.1016/0022-2364(92)90287-H, 1992.
Wang, Q., Shen, K., Logan, A. W. J., Colell, J. F. P., Bae, J., Ortiz Jr, G.
X., Theis, T., Warren, W. S., and Malcolmson, S. J.: Diazirines as Potential
Molecular Imaging Tags: Probing the Requirements for Efficient and
Long-Lived SABRE-Induced Hyperpolarization, Angew. Chem. Int. Edit., 56,
12112–12116, https://doi.org/10.1002/anie.201704970, 2017.
Zener, C.: Non-Adiabatic Crossing of Energy Levels, Proc. Roy. Soc. A, 833, 696–702, 1932.
Zhang, Y., Basu, K., Canary, J. W., and Jerschow, A.: Singlet lifetime
measurements in an all-proton chemically equivalent spin system by
hyperpolarization and weak spin lock transfers, Phys. Chem. Chem. Phys.,
17, 24370–24375, https://doi.org/10.1039/C5CP03716F, 2015.
Zhou, Z., Yu, J., Colell, J. F. P., Laasner, R., Logan, A., Barskiy, D. A.,
Shchepin, R. V., Chekmenev, E. Y., Blum, V., Warren, W. S., and Theis, T.:
Long-Lived
13C
2 Nuclear Spin States Hyperpolarized by Parahydrogen in
Reversible Exchange at Microtesla Fields, J. Phys. Chem. Lett., 8,
3008–3014, https://doi.org/10.1021/acs.jpclett.7b00987, 2017.
Zwanziger, J. W., Koenig, M., and Pines, A.: Berry's Phase, Annu. Rev. Phys.
Chem., 41, 601–646, https://doi.org/10.1146/annurev.pc.41.100190.003125, 1990.
