Rotating Frame Analog of Spin-Locking and Spin–Lattice Relaxation in the Doubly Rotating Frame

Tabuchi, Noriyuki; Hatanaka, Hiroshi

doi:10.1006/jmre.2000.2217

Cited by 3 publications

(5 citation statements)

References 12 publications

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“…5 show the experimental values of x 20 thus obtained for x 1 =2p ¼ 65 kHz, which are in good agreement with the theoretical ones (solid line) calculated with Eq. (16) or Eq. (17).…”

Section: Experimental Methodsmentioning

confidence: 96%

“…The resonance frequency x 20 =2p was measured from the TQ saturation curve observed for the relevant amplitude of the LF field with a PM pulse of the duration of about 4 ms. We used an averaging method similar to that used in a previous work [16] to reduce the contribution of the higher frequency oscillations to the TQ saturation curve.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…The u dependence of n x ð0Þ enables us to reduce the higher frequency oscillations by averaging the several magnitudes of M z ðtÞ obtained at different values of u [16]. However, any averaging method with the phase change cannot completely eliminate them because the time development of M z ðtÞ includes the components of the oscillations independent of u as is recognized by a more detailed analysis of Eq.…”

Section: Tq Nutationmentioning

confidence: 98%

“…The angles h and a depend on u m and x 1 =x 20 as seen from Eqs. (9) and (13), and the resonance condition (16) presents the relation between u m and x 1 =x 20 [see Eq. (17)].…”

Section: Basic Theory Of the Tq Resonancementioning

confidence: 99%

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Triple quantum nutation in the two-level NMR system in the rotating frame

Hatanaka

Sugiyama

Tabuchi

2003

Journal of Magnetic Resonance

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The authors present the detailed theory and the new results associated with the triple quantum (TQ) nutation and the line narrowing effect of the TQ resonance in the two-level NMR system which we reported previously. The TQ resonance is induced in the spin-locked system by the oscillating field produced by the sinusoidal phase modulation (PM) of the RF field. The theory predicts that the TQ nutation is accompanied by several higher frequency oscillations and we detected them experimentally by improving the detection system. These higher frequency oscillations are due to the fluctuation of the angle between the transverse or effective field causing the TQ nutation and the RF field. We obtain the result that the modulation index 2phim of the PM is the key parameter that essentially controls the conditions of the TQ resonance and the narrowing effect. Under the exact TQ resonance, the ratio of the TQ resonance frequency to the Larmor frequency of the RF field depends only on phim, and the secular part of the magnetic dipole Hamiltonian of a like spin system in the triply rotating frame disappears at a particular value of phim. The condition is different from that of the well-known magic angle condition.

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“…5 show the experimental values of x 20 thus obtained for x 1 =2p ¼ 65 kHz, which are in good agreement with the theoretical ones (solid line) calculated with Eq. (16) or Eq. (17).…”

Section: Experimental Methodsmentioning

confidence: 96%

Section: Experimental Methodsmentioning

confidence: 99%

Section: Tq Nutationmentioning

confidence: 98%

“…The angles h and a depend on u m and x 1 =x 20 as seen from Eqs. (9) and (13), and the resonance condition (16) presents the relation between u m and x 1 =x 20 [see Eq. (17)].…”

Section: Basic Theory Of the Tq Resonancementioning

confidence: 99%

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Triple quantum nutation in the two-level NMR system in the rotating frame

Hatanaka

Sugiyama

Tabuchi

2003

Journal of Magnetic Resonance

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“…Creating a distinguishable signature of magnetic resonance in a rf cantilever experiment may be challenging, however, since the motion of the cantilever and generation of the rf are not independent. New signal modulation schemesperhaps based on parametric amplification 176,177 or second resonance 178 -will undoubtedly need to be developed. While a radio frequency cantilever has not yet, to our knowledge, been brought near a sample surface as in a scanned probe microscope experiment, we believe there is no reason that this milestone cannot be reached given the current state of the art.…”

Section: Future Directions In Mechanically Detected Magnetic Resmentioning

confidence: 99%

Advances in mechanical detection of magnetic resonance

Kuehn

Hickman

Marohn

2008

The Journal of Chemical Physics

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The invention and initial demonstration of magnetic resonance force microscopy (MRFM) in the early 1990s launched a renaissance of mechanical approaches to detecting magnetic resonance. This article reviews progress made in MRFM in the last decade, including the demonstration of scanned probe detection of magnetic resonance (electron spin resonance, ferromagnetic resonance, and nuclear magnetic resonance) and the mechanical detection of electron spin resonance from a single spin. Force and force-gradient approaches to mechanical detection are reviewed and recent related work using attonewton sensitivity cantilevers to probe minute fluctuating electric fields near surfaces is discussed. Given recent progress, pushing MRFM to single proton sensitivity remains an exciting possibility. We will survey some practical and fundamental issues that must be resolved to meet this challenge.

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New Line-Narrowing Effect in Triple-Quantum Resonance in a Two-Level NMR System

Hatanaka¹,

Tabuchi

2002

Journal of Magnetic Resonance

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We report a new line-narrowing effect associated with triple-quantum resonance in a two-level NMR system. The experiment was carried out in the rotating frame on 19 F nuclei in Teflon; namely, the magnetization is spin-locked along the RF field and the triple-quantum resonance is induced by the oscillating field perpendicular to the RF field. We observed that the decay time of the triple-quantum nutation becomes extraordinarily long at a particular intensity and frequency of the oscillating field. The decay time is about seven times as long as that of the single-quantum nutation and also much longer than that of the magic angle nutation. The mechanism is not interpreted by straightforward analogy to the theory of the current magic angle narrowing.

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Rotating Frame Analog of Spin-Locking and Spin–Lattice Relaxation in the Doubly Rotating Frame

Cited by 3 publications

References 12 publications

Triple quantum nutation in the two-level NMR system in the rotating frame

Triple quantum nutation in the two-level NMR system in the rotating frame

Advances in mechanical detection of magnetic resonance

New Line-Narrowing Effect in Triple-Quantum Resonance in a Two-Level NMR System

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