NMR-Spectrometer for Diffusion Measurements

Our Frankenstein NMR Spectrometer has a 1H/19F channel and a high performance PFG system.

The Probe is from Doty(R) and the gradient amplifier from AETechron.

The console uses the undefinedDAMARIS software.

 Other parts are:

RF-amplifier: Barthel HF-Technik

Temp. controler: Doty (R)

Freq. generator: PTS

Shim power sopply: Oxford (manual)

Cable driver: DAMARIS schematics





The Expt. Control Software

The DAMARIS (undefinedDArmstadt MAgnetic Resonance Instrument Software) is an open source  framework for NMR spectrometer control. It is written in python and provides a GUI window with acquisition plots. It requires python programing skills and pulse sequence programing capabilities from the operator. It is however very versatile and allows the gifted operator set up complex experiments and costumize the software to its very own needs.

The Schematics

Here are all relevant electronic parts put together.

Probe and Magnet

Wide bore Magnet, 1H @ 300 MHz, Bruker

Shim Stack from Bruker

 Doty(R) probe for 5mm, static, z gradient (air or water cooled)

The RF-Amplifier and the Attenuator

A Spectrum

Testing the Gradients

By applying very high gradients (10A) we recover them to zero within 10ms, according to Hrovats experiment as shown by the figures.

A PFG Diffusion Measurement

PFG NMR diffusion measurement of water.

Optimizing the Gradients

The  controlled  current mode provide with a higher gradient responsivity as compared to the  controlled mode voltage mode, as shown by the figure.In the  current controlled mode however, the amplifier must be set to standby when not pulsing. That was acchieved by the use of curcuit breakers.

Dr. Nader de Sousa Amadeu

We research on NMR applications to new materials like MOF, COF, graphene etc.

Verantwortlich für den Inhalt: E-Mail sendenDr. Amadeu