171 research outputs found
Ab initio oscillator strengths for transitions between J=1 odd and J=1,2 even excited states of Ne I
Ab initio theory is developed for radiative transitions between excited
states of neon. Calculations of energies for even excited states J=1, J=2
supplement our previous calculations for J=1 odd excited states. Line strengths
for transitions between J=1 odd and J=1,2 even states of Ne I are evaluated. A
comparison with experiments and semiempirical calculations is given.Comment: 5 page
NMR detection with an atomic magnetometer
We demonstrate detection of NMR signals using a non-cryogenic atomic
magnetometer and describe several novel applications of this technique. A water
free induction decay (FID) signal in a 0.5 T field is detected using a
spin-exchange-relaxation-free K magnetometer and the possibility of using a
multi-channel magnetometer for 3-D MRI requiring only a single FID signal is
described. We also demonstrate detection of less than Xe
atoms whose NMR signal is enhanced by a factor of 540 due to Fermi-contact
interaction with K atoms. This technique allows detection of less than
Xe spins in a flowing system suitable for remote NMR applications
Detection of NMR signals with a radio-frequency atomic magnetometer
We demonstrate detection of proton NMR signals with a radio frequency atomic
magnetometer tuned to the NMR frequency of 62 kHz. High-frequency operation of
the atomic magnetometer makes it relatively insensitive to ambient magnetic
field noise. We obtain magnetic field sensitivity of 7 fT/Hz using only
a thin aluminum shield. We also derive an expression for the fundamental
sensitivity limit of a surface inductive pick-up coil as a function of
frequency and find that an atomic rf magnetometer is intrinsically more
sensitive than a coil of comparable size for frequencies below about 50 MHz.Comment: 7 page
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