Spinor Double-Quantum Excitation in the Solution NMR of Near-Equivalent Spin-1/2 Pairs
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arXiv
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| Auteurs principaux: | , , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866908820746272768 |
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| author | Heramun, Urvashi D. Sabba, Mohamed Yamano, Dolnapa Bengs, Christian Legrady, Bonifac Pileio, Giuseppe Thompson, Sam Levitt, Malcolm H. |
| author_facet | Heramun, Urvashi D. Sabba, Mohamed Yamano, Dolnapa Bengs, Christian Legrady, Bonifac Pileio, Giuseppe Thompson, Sam Levitt, Malcolm H. |
| contents | A family of double-quantum excitation schemes is described for the solution nuclear magnetic resonance (NMR) of near-equivalent spin-1/2 pairs. These new methods exploit the spinor behaviour of 2-level systems, whose signature is the change of sign of a quantum state upon a $2π$ rotation. The spinor behaviour is used to manipulate the phases of single-quantum coherences, in order to prepare a double-quantum precursor state which is rapidly converted into double-quantum coherence by a straightforward $π/2$ rotation. One set of spinor-based methods exploits symmetry-based pulse sequences, while the other set exploits SLIC (spin-lock-induced crossing), in which the nutation frequency under a resonant radiofrequency field is matched to the spin-spin coupling. A variant of SLIC is introduced which is well-compensated for deviations in the radiofrequency field amplitude. The methods are demonstrated by performing double-quantum-filtered $^{19}$F NMR on a molecular system containing a pair of diastereotopic $^{19}$F nuclei. The new methods are compared with existing techniques. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_08157 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Spinor Double-Quantum Excitation in the Solution NMR of Near-Equivalent Spin-1/2 Pairs Heramun, Urvashi D. Sabba, Mohamed Yamano, Dolnapa Bengs, Christian Legrady, Bonifac Pileio, Giuseppe Thompson, Sam Levitt, Malcolm H. Quantum Physics Chemical Physics A family of double-quantum excitation schemes is described for the solution nuclear magnetic resonance (NMR) of near-equivalent spin-1/2 pairs. These new methods exploit the spinor behaviour of 2-level systems, whose signature is the change of sign of a quantum state upon a $2π$ rotation. The spinor behaviour is used to manipulate the phases of single-quantum coherences, in order to prepare a double-quantum precursor state which is rapidly converted into double-quantum coherence by a straightforward $π/2$ rotation. One set of spinor-based methods exploits symmetry-based pulse sequences, while the other set exploits SLIC (spin-lock-induced crossing), in which the nutation frequency under a resonant radiofrequency field is matched to the spin-spin coupling. A variant of SLIC is introduced which is well-compensated for deviations in the radiofrequency field amplitude. The methods are demonstrated by performing double-quantum-filtered $^{19}$F NMR on a molecular system containing a pair of diastereotopic $^{19}$F nuclei. The new methods are compared with existing techniques. |
| title | Spinor Double-Quantum Excitation in the Solution NMR of Near-Equivalent Spin-1/2 Pairs |
| topic | Quantum Physics Chemical Physics |
| url | https://arxiv.org/abs/2602.08157 |