Ortho- and Parahydrogen Induced Nuclear Spin Polarization*

Bargon, Joachim; Kandels, Jörg; Woelk, Klaus

doi:10.1524/zpch.1992.1.part_1.065

Cited by 4 publications

(8 citation statements)

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“…3. The initial state and the detection state in all magnetic resonance experiments are simple collections of single-spin or two-spin (in exotic experiments such as PHIP [47] and CIDNP [48][49][50]) orders -the magnetization that strays too far from these narrow regions of the vast state space might never find its way back.…”

Section: State Space Restriction Using Interaction Topologymentioning

confidence: 99%

Spinach – A software library for simulation of spin dynamics in large spin systems

Hogben

Krzystyniak

Charnock

et al. 2011

Journal of Magnetic Resonance

424

486

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Section: State Space Restriction Using Interaction Topologymentioning

confidence: 99%

Spinach – A software library for simulation of spin dynamics in large spin systems

Hogben

Krzystyniak

Charnock

et al. 2011

Journal of Magnetic Resonance

424

486

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“…For a final molecule involving a spin system larger than AX, overpopulation may be transferred to other spins through the combination of the different commutators involved in an equation analogous to Eq. [7], with a Hamiltonian corresponding to the whole spin system. Some transfers are possible only in the case of an ALTADENA experiment (hydrogenation reaction in zero, or almost zero, static magnetic field).…”

Section: The Steady-state Density Operatormentioning

confidence: 99%

“…For more than 30 years, it has been known that the sensitivity of the NMR experiment can be increased (up to a factor of 10 4 -10 5 ) by means of para-enriched hydrogen (p-H 2 ) inserted in a molecule at two nonequivalent positions by an appropriate chemical reaction. This hydrogenation reaction (generally using homogeneous catalytic processes) can be performed outside the magnet of the NMR machine (ALTA-DENA experiment) or inside (PASADENA experiment) (1)(2)(3)(4)(5)(6)(7)(8)(9). We do not go into the details of those experiments, but rather concentrate on the hyperpolarization phenomenon.…”

Section: Introductionmentioning

confidence: 99%

Para‐hydrogen enrichment and hyperpolarization

Canet

Aroulanda

Mutzenhardt

et al. 2006

Concepts Magnetic Resonance

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This article begins with general considerations about enrichment of hydrogen gas into its para isomer (corresponding to nuclear spins in the singlet state); this is a necessary condition to obtain hyperpolarization from transfer of the relevant population excess. This transfer is generally mediated by a hydrogenation reaction such that the two protons become nonequivalent. The energy level populations of this new spin system can be calculated unambiguously using a density matrix formalism. This formalism is reviewed, and the authors propose a simple method that leads to the spin state after the hydrogenation reaction and the insertion of the sample in the NMR magnet. The effect of radiofrequency pulses is also considered.

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“…Although compound D involves two deuterium nuclei and represents therefore a more complex spin system, it is deemed useful to determine how 13 C hyperpolarization arises in a symmetric molecule [6] described as an AA 0 X spin system.…”

Section: Application To the Aa 0 X Systemmentioning

confidence: 99%

“…It is now well established that the addition of hydrogen enriched in the para spin state (para-H 2 ) to organic or inorganic compounds can lead to strongly enhanced absorptions/emissions in the 1 H NMR spectrum of the hydrogenated substrates [1][2][3][4][5][6].…”

Section: Introductionmentioning

confidence: 99%