Two-photon excitation in nuclear quadrupole resonance

We introduce a novel magnetic resonance experiment in which nuclear quadrupole resonance (NQR) is observed following excitation at 1/2 the resonant frequency. Such two-photon excitation has recently been demonstrated in nuclear magnetic resonance, and may also have practical application to NQR. We s...

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Bibliographic Details
Published in:Chemical physics letters 2003-07, Vol.376 (3), p.268-273
Main Authors: Eles, P.T., Michal, C.A.
Format: Article
Language:English
Subjects:
Atomic and molecular physics
Exact sciences and technology
Molecular properties and interactions with photons
Nuclear resonance and relaxation
Physics
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Summary:We introduce a novel magnetic resonance experiment in which nuclear quadrupole resonance (NQR) is observed following excitation at 1/2 the resonant frequency. Such two-photon excitation has recently been demonstrated in nuclear magnetic resonance, and may also have practical application to NQR. We show analytically that for axially symmetric quadrupole interactions ( η=0), two-photon NQR in zero magnetic field produces observable magnetization only perpendicular to the rf excitation coil, necessitating a second coil for detection. If η≠0 or an external magnetic field is applied, magnetization observable in the excitation coil is produced. We demonstrate the phenomenon experimentally by exciting the 35Cl resonance in a single crystal of sodium chlorate in the presence of a weak magnetic field.
ISSN:0009-2614
1873-4448
DOI:10.1016/S0009-2614(03)00969-2