Transient Effects in Nuclear Spin Noise Spectroscopy
Sprache des Vortragstitels:
Englisch
Original Tagungtitel:
EUROMAR 2016
Sprache des Tagungstitel:
Englisch
Original Kurzfassung:
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.
Forschungs-