论文信息 - Ultralow power low noise ultrahigh frequency magnetic resonance spectrometer

Ultralow power low noise ultrahigh frequency magnetic resonance spectrometer

We describe a simple marginal oscillator that operates at ultralow power dissipation (≥20 μW at 750 MHz) for use in ultrasensitive low noise magnetic resonance detection at very low temperatures. We have operated the circuit down to 0.6 K with the sample maintained below 20 mK and in magnetic fields up to 4.0 T. The samples are maintained at mK temperatures by physically separating the sample from the rf coil.

N. Sullivan | L. Phelps | P. M. Andersen | J. Legg

[1] N. Sullivan,et al. Asymmetry of field-perturbed NQR spectra: A new ultra-low temperature thermometer?☆ , 1991 .

[2] M. Richards,et al. Cryogenic GaAs FET amplifiers and their use in NMR detection , 1986 .

[3] N. Sullivan,et al. Low-dissipation tunable rf preamplifier for low temperature NMR applications. , 1978, Review of Scientific Instruments.

[4] F. Robinson,et al. A stable low-level oscillator with cryogenic applications , 1976 .

[5] M. Inoue,et al. NMR Marginal Oscillator with MOS-FET Operating at Low Temperature , 1973 .

[6] J. Anderson,et al. Low Level Tracking Marginal Oscillator for in situ Magnetic Field Measurements at Low Temperatures , 1972 .

[7] R. M. Cotts,et al. Helium Cooled Radio Frequency Preamplifier for Use in NMR , 1968 .

[8] R. Pound,et al. A Radiofrequency Spectrograph and Simple Magnetic-Field Meter , 1950 .

[9] N. Sullivan,et al. Cryogenic UHF FET oscillator for magnetic resonance detection , 1988 .

[10] C. Hagmann,et al. Microwave Detector for Galactic Halo Axions , 1987 .

[11] B. Lengeler,et al. Tunable low−temperature NMR oscillator for magnetic field measurements , 1975 .

[12] W. Weyhmann,et al. A Tunnel Diode NMR Spectrometer , 1973 .