engleski

Nuclear Magnetic Spin Noise in Resonant Circuits

Nuclear Magnetic Spin Noise was predicted in 1946 by Bloch [1] as an intrinsic property of finite ensembles of spins. With modern high-resolution NMR spectrometers, in particular with cryogenically cooled probes, spin noise observation is straightforward and has been used to image spin density without rf-excitation and irrespective of longitudinal relaxation [2]. Recent experiments in our labs concern the fundamentals of spin noise spectroscopy. Quantification of spin noise turns out to be a complex issue due to effects of radiation damping and tuning offset. The dependence of spin noise spectra on the properties of the receiving resonance circuit deviates significantly from what is predicted by Ernst and McCoy [3]. References [1] Bloch F. ; Phys. Rev. 70, 460 1946 [2] Müller N., Jerschow A. ; Proc. Nat. Acad. Sci. (USA) 103, 6790 2006 [3] McCoy M.A., Ernst R.R., Chem. Phys. Lett. 139, 587, 1989 Acknowledgements This research is supported by the Austrian Science Funds FWF, project P19635-N17, a grant by the US NSF (CHE-0550054), the ÖAD (WTZ (AT-HR) and the Croatian Ministry of Science, Education and Sports (project 098-0982929-2917)

Nuclear Magnetic Spin Noise; line shapes

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