期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 5, 期 19, 页码 3421-3426出版社
AMER CHEMICAL SOC
DOI: 10.1021/jz501754j
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资金
- Russian Science Foundation [14-13-01053]
- Russian Science Foundation [14-13-01053] Funding Source: Russian Science Foundation
A method is proposed to transfer spin order from para-hydrogen, that is, the H-2 molecule in its singlet state, to spin-1/2 heteronuclei of a substrate molecule. The method is based on adiabatic passage through nuclear spin level anticrossings (LACs) in the doubly rotating frame of reference; the LAC conditions are fulfilled by applying resonant RF excitation at the NMR frequencies of protons and the heteronuclei. Efficient conversion of the para-hydrogen-induced polarization into net polarization of the heteronuclei is demonstrated; the achieved signal enhancements are about 6400 for C-13 nuclei at natural abundance. The theory behind the technique is described; advantages of the method are discussed in detail.
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