We have constructed a new instrument for observation of new NMOS phenomena. The instrument combines optical setup with electromagnet coils, which are used to manipulate nuclear spins. Because of the unique nature of the instrument, it was necessary to design it from scratch. After the initial concept phase, we explored the market for the most convenient and versatile components, both for the optical part and the electromagnet coil. The electromagnet had to be custom designed and built in order to meet the specifications. The construction has been mostly completed within the first year of the project. A significant amount of time was required for the set up of the data acquisition and instrument control, which is done via software-hardware interface to custom-written LabVIEW programs.
A notable increase in NMOS signal strength can be achieved by employing so-called hyperpolarization techniques, which allow the sample to yield a much stronger signal. After reviewing our options, it has been decided to pursue a SABRE (signal amplification by reversible exchange) hyperpolarization technique. SABRE allows to hyperpolarize a number of nuclei using a rather low cost infrastructure, in contrast to some other hyperpolarization techniques. In order to efficiently utilize this approach in our NMOS experiments, a dedicated SABRE polarizer has been designed and constructed. It has been tested and showed over two orders of magnitude stronger signal, compared to standard approach without hyperpolarization. The construction of the polarizer has taken several months, which was not taken into account in its completeness in the proposed time schedule. However, it provides us with an unexpectedly strong and versatile starting point for upcoming experiments.
The project also involved a theoretical part, where it has been shown that some of the NMOS effects reflect very sensitively structure of the electron cloud upon excitation. This may have a significant impact on the studies of excited states using NMOS methods.
The main results of the project are thus successful construction of the first NSOR instrument in Europe, which is extendable to accommodate other NMOS effects as well, and a stand-alone, unique SABRE polarizer, which can be used both in the upcoming NMOS as well as in other experiments. In addition, we have explored the applications of the NMOS effects by theoretical calculations.
The results of the theoretical calculations have been published in a peer-reviewed article and three conferences (2 presentations, 1 poster). The article documenting the SABRE polarizer is currently in preparation for publication in international journal and has already been presented at two conferences (1 presentation, 1 poster). The development of the state-of-the-art NMOS instrument towards new horizons is underway. The overall project has been presented to the general public at Researcher's night 2017.
