Superconducting quantum interference device detection of acoustic nuclear quadrupole resonance ofSb121andSb123in antimony metal

1984 ◽  
Vol 30 (7) ◽  
pp. 3644-3648 ◽  
Author(s):  
Keith S. Pickens ◽  
D. I. Bolef ◽  
M. R. Holland ◽  
R. K. Sundfors
Keyword(s):  
Nuclear Quadrupole Resonance ◽  
Quantum Interference ◽  
Superconducting Quantum Interference Device ◽  
Superconducting Quantum Interference ◽  
Quadrupole Resonance ◽  
Nuclear Quadrupole

Nitrogen-14 SQUID NQR of L-Ala-L-His and of Serine

1994 ◽  
Vol 49 (12) ◽  
pp. 1188-1192 ◽  
Author(s):  
Ulrike Werner-Zwanziger ◽  
Marcia Ziegeweid ◽  
Bruce Black ◽  
Alexander Pines
Keyword(s):  
Amino Acids ◽  
Nuclear Quadrupole Resonance ◽  
Intermolecular Interactions ◽  
Quantum Interference ◽  
Amino Nitrogen ◽  
Resonance Spectroscopy ◽  
Superconducting Quantum Interference Device ◽  
Small Peptides ◽  
Quadrupole Resonance ◽  
Nuclear Quadrupole

Abstract14N nuclear quadrupole resonance spectroscopy, detected with a Superconducting Quantum Interference Device, makes possible the study of nitrogen environments in amino acids and small peptides. The present experiments characterize: 1) the effects of intermolecular interactions upon the amino nitrogen of serine upon cocrystallization of the stereoisomers in a range of concentrations; 2) the changes of the amino and imidazole nitrogen environments brought about by combining L-Alanine and L-Histidine into the dipeptide L-Ala-L-His.

scholarly journals Low Frequency Nuclear Quadrupole Resonance with SQUID Amplifiers

1994 ◽  
Vol 49 (1-2) ◽  
pp. 5-13 ◽  
Author(s):  
John Clarke
Keyword(s):  
Nuclear Quadrupole Resonance ◽  
Quantum Interference ◽  
Spin Echo ◽  
Relaxation Times ◽  
Noise Temperature ◽  
Low Frequency ◽  
Input Circuit ◽  
Transverse Relaxation ◽  
Quadrupole Resonance ◽  
Nuclear Quadrupole

Abstract The dc SQUID (Superconducting QUantum Interference Device) can be configured as an ampli­fier of spin-echos with a noise temperature of approximately 10 mK (f/1 M Hz) at an operating temperature of 1.5 K. A Fourier transform spectrometer based on a SQUID with a superconducting input circuit and operated in a flux-locked loop is used to obtain nuclear quadrupole resonance (NQR) spectra in a broadband m ode over the bandwith 0 -1 M Hz. Spin-echo spectra of 14N in NH4ClO4 reveal sharp NQR resonances, obtained simultaneously, at 17.4, 38.8 and 56.2 kHz. At 1.5 K, the measured longitudinal and transverse relaxation times T1 and T2 for the 38.8 kHz transition are 63 ± 3 ms and 22±2 ms, respectively.

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