Transient Effects in Nuclear Spin Noise Spectroscopy

Description

The work presented here sheds light on a novel effect which has been discovered during our continued research in the field of spin noise NMR.[1] While conducting spin noise experiments, it has been noticed that the line shapes in 1D magnitude or power spectra is dependent not only on the setup of the spectrometer (cable length, etc.) but also on the acquisition time (Figure 1). This is surprising because a spin noise signal is in theory time-independent. Since then considerable effort has been put into the understanding and quantification of this phenomenon. Because the processing of the recoded data is not entirely straight forward, due to the lead-in points caused by the digital signal processor and some idiosyncrasies of Bruker’s “convd2a” routine, one prerequisite was the adaption of the in-house developed processing toolkit “MxNMR”. This is a custom program for use in the TopSpin environment designed with flexibility and speed in mind. New experimental setups and processing schemes were implemented to elucidate the origins of these experimental observations, which could be tracked down to the transmit-receive switch in the pre-amplifier. Furthermore, the latest results on spin noise gradient echoes and the interference of radiation damping and spin noise are presented.

Period	04 Jul 2016
Event title	EUROMAR 2016
Event type	Conference
Location	DenmarkShow on map