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Title: 13C Radiofrequency Amplification by Stimulated Emission of Radiation Threshold Sensing of Chemical Reactions

Journal Article · · Journal of the American Chemical Society
ORCiD logo [1]; ORCiD logo [2];  [3];  [2];  [4];  [4];  [2];  [5];  [6]; ORCiD logo [7];  [8]; ORCiD logo [3]; ORCiD logo [9]
  1. Wayne State Univ., Detroit, MI (United States). Karmanos Cancer Institute (KCI); Univ. of Freiburg (Germany); German Cancer Consortium (DKTK), Heidelberg (Germany); North Carolina State University
  2. Wayne State Univ., Detroit, MI (United States). Karmanos Cancer Institute (KCI)
  3. North Carolina State University, Raleigh, NC (United States)
  4. Univ. of Freiburg (Germany)
  5. Univ. of Freiburg (Germany); German Cancer Consortium (DKTK), Heidelberg (Germany)
  6. Massachusetts General Hospital, Boston, MA (United States). A. A. Martinos Center for Biomedical Imaging; Harvard Univ., Cambridge, MA (United States)
  7. Karlsruhe Inst. of Technology (KIT) (Germany)
  8. RWTH Aachen Univ. (Germany); Forschungszentrum Juelich (Germany). Central Institute for Engineering, Electronics and Analytics─Electronic Systems (ZEA-2)
  9. Wayne State Univ., Detroit, MI (United States). Karmanos Cancer Institute (KCI); Russian Academy of Sciences (RAS), Moscow (Russian Federation)

Conventional nuclear magnetic resonance (NMR) enables detection of chemicals and their transformations by exciting nuclear spin ensembles with a radio-frequency pulse followed by detection of the precessing spins at their characteristic frequencies. The detected frequencies report on chemical reactions in real time and the signal amplitudes scale with concentrations of products and reactants. Here, we employ Radiofrequency Amplification by Stimulated Emission of Radiation (RASER), a quantum phenomenon producing coherent emission of 13C signals, to detect chemical transformations. The 13C signals are emitted by the negatively hyperpolarized biomolecules without external radio frequency pulses and without any background signal from other, nonhyperpolarized spins in the ensemble. Here, we studied the hydrolysis of hyperpolarized ethyl-[1-13C]acetate to hyperpolarized [1-13C]acetate, which was analyzed as a model system by conventional NMR and 13C RASER. The chemical transformation of 13C RASER-active species leads to complete and abrupt disappearance of reactant signals and delayed, abrupt reappearance of a frequency-shifted RASER signal without destroying 13C polarization. Further, the experimentally observed “quantum” RASER threshold is supported by simulations.

Research Organization:
North Carolina State University, Raleigh, NC (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Contributing Organization:
Wayne State University
Grant/Contract Number:
SC0023334
OSTI ID:
2341430
Journal Information:
Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society Journal Issue: 20 Vol. 145; ISSN 0002-7863
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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