Optimal drive condition for nonlinearity reduction in electrostatic microresonators
A model for the amplitude-frequency (A-f) effect in electrostatic microresonators is presented. This effect is an undesired nonlinear phenomenon that sets the maximum usable oscillation current and th...
A model for the amplitude-frequency (A-f) effect in electrostatic microresonators is presented. This effect is an undesired nonlinear phenomenon that sets the maximum usable oscillation current and th...
Comment on "Computation of Young's moduli for chiral single-walled carbon nanotubes" [Appl. Phys. Lett. 88, 251908 (2006)]
Subfemtotesla radio-frequency atomic magnetometer for detection of nuclear quadrupole resonance
Appl. Phys. Lett. 89, 214106 (2006); doi:10.1063/1.2390643
Published 20 November 2006
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A radio-frequency tunable atomic magnetometer is developed for detection of nuclear quadrupole resonance (NQR) from room temperature solids. It has a field sensitivity 0.24 fT/Hz1/2 at the 423 kHz 14N NQR frequency of ammonium nitrate. A potential application of the magnetometer is detection of nitrogen-containing explosives which is difficult with conventional tuned copper coils due to a poor signal-to-noise ratio (SNR) below a few megahertz. The NQR signal from 22 g of powdered ammonium nitrate located 2 cm away from the sensor is detected with a SNR of 9 in a 4.4-s-long multiple echo sequence, which represents an estimated order-of-magnitude improvement in sensitivity over the pickup coil detection.
©2006 American Institute of Physics
| History: | Received 7 September 2006; accepted 3 October 2006; published 20 November 2006 |
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