Temperature dependence of the spin-lattice relaxation of<sup>35</sup>Cl nuclei in solid p-chlorobenzenesulphonyl chloride

Pusiol, D. J.; Brunetti, A. H.

doi:10.1088/0022-3719/17/25/011

Cited by 17 publications

(14 citation statements)

References 5 publications

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“…The experiments were carried out on a home-made FT NQR spectrometer reported elsewhere [11]. Pulse excitation was from a 150 W Amplifier Research transmitter.…”

Section: Methodsmentioning

confidence: 99%

Performance of frequency-modulated pulses in NQR

Schürrer

Pérez

1999

Appl. Magn. Reson.

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This paper presents an analysis of the performance of frequency-modulated pulses and of pulses modulated simultaneously in amplitude and frequency in the pure nuclear quadrupolar resonance (NQR) spectroscopy of spin 3/2 nuclei. Computer simulations are given of the offset compensation efficiency of such pulses as applied to single crystals. Spin evolution equations were solved numerically. Experimental measurements, using FM pulses, of the 35 C1 NQR of sodium chlorate (NaC1O3 ) single crystal and of mercuric chloride (HgCl 2 ) powder are reported. The results suggest that frequency modulated pulses are alternative pulses to composite pulses in NQR.

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“…The experiments were carried out on a home-made FT NQR spectrometer reported elsewhere [11]. Pulse excitation was from a 150 W Amplifier Research transmitter.…”

Section: Methodsmentioning

confidence: 99%

Performance of frequency-modulated pulses in NQR

Schürrer

Pérez

1999

Appl. Magn. Reson.

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“…The sample container was a cylinder of 1 cm diameter; the amount of sample used was about 2 g. The measurements were taken using a Fourier transform pulse spectrometer. 11 The temperature stability was controlled to within 0.1 K using a homemade cryogenic system. Copperconstantan thermocouples were employed for the temperature measurements.…”

Section: Methodsmentioning

confidence: 99%

Order-disorder phase-transformation kinetics inp-chloronitrobenzene studied by nuclear quadrupole resonance

et al. 1997

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p-chloronitrobenzene crystallizes in the centrosymmetric space group P2 1 /c. Since the molecule does not possess an inversion point, the crystal exhibit orientational disorder. Recently, it was found that this compound has an ordered phase stable below 282.6 K. In the present work, we study the order-disorder phase transformation kinetic using nuclear quadrupole resonance. Isothermal transformation curves for nine different temperatures are analyzed following the theory developed by Cahn. In both the order-disorder and disorder-order phase transformation, nucleation seems to take place at grain edges. The nucleation rate v I E and growth rate ␥ for different temperatures have been determined. We have systematically observed a time dependence for ␥ which only remains constant at an early stage of the reaction. This time behavior can be correctly described assuming that the activation energy associated with growth process increases linearly when the nucleus radius reaches a critical value. Experimental data also show that the ordering process is inhibited for temperatures greater than ϳ273 K ͑far below the phase-transition point at 282.6 K͒. This behavior seems to be a consequence of the existence of different microscopic environments in the disordered phase. ͓S0163-1829͑97͒04445-7͔

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“…35 Cl NQR measurements were performed from liquidnitrogen temperatures to 370 K. The NQR spectrometer was described elsewhere. 22 The NQR line shape was obtained from the fast Fourier transform echo /2Ϫ reconstruction method. 23 The /2 pulse was 23 s width and 150 W power.…”

Section: Methodsmentioning

confidence: 99%

Finite-size effects on the incommensurate phase transition of bis(4-chlorophenyl)sulphone studied byCl35NQR

1996

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The temperature behavior of the 35 Cl nuclear quadrupolar resonance ͑NQR͒ spectrum of thin bis͑4-chlorophenyl͒sulphone films grown on fine powder samples of TiO 2 was studied. In order to characterize the structural and dynamical changes, a comparative study of the NQR parameters of the film with respect to the bulk samples was performed in the temperature range 80-370 K. A shift of the incommensurate phasetransition temperature from 150 in bulk to 156 K in film was detected. Also, the observed NQR spectra in the incommensurate phase suggest qualitative changes in the modulation. The presence of a central intense peak below the transition temperature indicates important contributions to the NQR spectra from periodic domains in the film. ͓S0163-1829͑96͒09129-1͔

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Temperature dependence of the spin-lattice relaxation of³⁵Cl nuclei in solid p-chlorobenzenesulphonyl chloride

Cited by 17 publications

References 5 publications

Performance of frequency-modulated pulses in NQR

Performance of frequency-modulated pulses in NQR

Order-disorder phase-transformation kinetics inp-chloronitrobenzene studied by nuclear quadrupole resonance

Finite-size effects on the incommensurate phase transition of bis(4-chlorophenyl)sulphone studied byCl35NQR

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Temperature dependence of the spin-lattice relaxation of35Cl nuclei in solid p-chlorobenzenesulphonyl chloride

Cited by 17 publications

References 5 publications

Performance of frequency-modulated pulses in NQR

Performance of frequency-modulated pulses in NQR

Order-disorder phase-transformation kinetics inp-chloronitrobenzene studied by nuclear quadrupole resonance

Finite-size effects on the incommensurate phase transition of bis(4-chlorophenyl)sulphone studied byCl35NQR

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Temperature dependence of the spin-lattice relaxation of³⁵Cl nuclei in solid p-chlorobenzenesulphonyl chloride