Two-photon excitation in nuclear quadrupole resonance

✍ Scribed by P.T. Eles; C.A. Michal

• Publisher: Elsevier Science
• Year: 2003
• Tongue: English
• Weight: 197 KB
• Volume: 376
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/s0009-2614(03)00969-2

✦ Synopsis

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 (g ¼ 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 g 6 ¼ 0 or an external magnetic field is applied, magnetization observable in the excitation coil is produced. We demonstrate the phenomenon experimentally by exciting the 35 Cl resonance in a single crystal of sodium chlorate in the presence of a weak magnetic field.