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Chihara, H.; Nakamura, N.

doi:10.1007/10565418_18

Cited by 4 publications

(7 citation statements)

References 81 publications

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“…in the VHF range. However, there exist several nuclei such as 81 Br, 79 Br, 127 I, 209 Bi, and others with a large quadrupole moment and thus typically high frequencies between several tens and several hundreds of MHz [7]. NQR spectra are frequently considerably broad, i.e.…”

Section: Measurement Science and Technologymentioning

confidence: 99%

A no-tune no-match wideband probe for nuclear quadrupole resonance spectroscopy in the VHF range

Scharfetter¹,

Petrovic²,

Eggenhofer³

et al. 2014

Meas. Sci. Technol.

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Nuclear quadrupole resonance (NQR) spectroscopy is a method for the characterization of chemical compounds containing so-called quadrupolar nuclei. Similar to nuclear magnetic resonance (NMR), the sample under investigation is irradiated with strong radiofrequency (RF) pulses, which stimulate the emission of weak RF signals from the quadrupolar nuclei. The signals are then amplified and Fourier transformed so as to obtain a spectrum. In principle, narrowband NQR spectra can be measured with NMR spectrometers. However, pure NQR signals require the absence of a static magnetic field and several special applications require the characterization of a substance over a large bandwidth, e.g. 50–100% of the central frequency, which is hardly possible with standard NMR equipment. Dedicated zero-field NQR equipment is not widespread and current concepts employ resonating probes which are tuned and matched over a wide range by using mechanical capacitors driven by stepper motors. While providing the highest signal to noise ratio (SNR) such probes are slow in operation and can only be operated from dedicated NMR consoles. We developed a low-cost NQR wideband probe without tuning and matching for applications in the very high frequency (VHF) range below 300 MHz. The probe coil was realized as part of a reactive network which approximates an exponential transmission line. The input reflection coefficient of the two developed prototype probe coils is ≤ 20 dB between 90–145 MHz and 74.5–99.5 MHz, respectively. Two wideband NQR spectra of published test substances were acquired with an SNR of better than 20 dB after sufficient averaging. The measured signals and the SNR correspond very well to the theoretically expected values and demonstrate the feasibility of the method. Because there is no need for tuning and matching, our probes can be operated easily from any available NMR console.

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Section: Measurement Science and Technologymentioning

confidence: 99%

A no-tune no-match wideband probe for nuclear quadrupole resonance spectroscopy in the VHF range

Scharfetter¹,

Petrovic²,

Eggenhofer³

et al. 2014

Meas. Sci. Technol.

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“…where the firnetions qq) and g(q) have been determined numerically [36] over the full range of q. These functions are plotted for reference in Fig.…”

Section: Nqr Hamiltonianmentioning

confidence: 99%

“…was tabulated in [36], and varies fiom 1 for q = 0 to 1.8 for q = 1. The &5/243 +3/2 transition occurs at v, = 2vQf(q), and f(q) varies fiom 1 at q = 0 to 0.88 at q = 1 [36].…”

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confidence: 99%

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NMR and NQR study of the thermodynamically stable quasicrystals

Shastri

1995

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“…Nuclear quadrupole resonance (NQR) is a very useful technique for studying the static as well as the dynamic properties of a solid (Chihara and Nakamura 1980). The compound studied in this work is 2,3,6-trichloroanisole (2,3, in the solid state.…”

Section: Introductionmentioning

confidence: 99%

³⁵Cl nuclear quadrupole resonance analysis of the solid 2,3,6-trichloroanisole

Pertile¹,

Ramia²,

Martín³

1993

J. Phys.: Condens. Matter

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The temperature dependences of 35CI nuclear quadrupole resonance frequencies YQ, spin-lattice relaxation times TI, linewidth AV and spin-spin relaxation time Tz of the solid 2,3,6-trichloroanisole are reported. Three resonance lines are observed and the experimental measurements of VQ(T) data are analysed by means of the Bayer-Kushida theory. It appears that only low-frequency lattice modes contribute to the tempemure dependence of VQ(T). The T,(T) relaxation data show a n o d behaviour and no thermally activated motion is detected. The linewidth measurements reveal that the electric field gradient affecting the c1 atoms of the molecule undergoes some sort of thermally activated motional narrowing. The E ( T ) data are somewhat SCM+ showing only a normal temperature behaviour for one of the chlorine atoms of the molecule while for the others it is of the order of q.

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References

Cited by 4 publications

References 81 publications

A no-tune no-match wideband probe for nuclear quadrupole resonance spectroscopy in the VHF range

A no-tune no-match wideband probe for nuclear quadrupole resonance spectroscopy in the VHF range

NMR and NQR study of the thermodynamically stable quasicrystals

³⁵Cl nuclear quadrupole resonance analysis of the solid 2,3,6-trichloroanisole

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References

Cited by 4 publications

References 81 publications

A no-tune no-match wideband probe for nuclear quadrupole resonance spectroscopy in the VHF range

A no-tune no-match wideband probe for nuclear quadrupole resonance spectroscopy in the VHF range

NMR and NQR study of the thermodynamically stable quasicrystals

35Cl nuclear quadrupole resonance analysis of the solid 2,3,6-trichloroanisole

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³⁵Cl nuclear quadrupole resonance analysis of the solid 2,3,6-trichloroanisole