High Throughput Nuclear Resonance Time Domain Interferometry using Annular Slits

Nuclear resonance time domain interferometry (NR-TDI) is used to study the slow dynamics of liquids (that do not require M\"{o}ssbauer isotopes) at atomic and molecular length scales. We employed the TDI method of using a stationary two-line magnetized \ce{^{57}Fe} foil as a source and a stationary single-line stainless steel foil analyzer. Our new technique of adding an annular slit in front of a single silicon avalanche photodiode (APD) detector enables a wide range of momentum transfers $\qty(\num{1}\text{ to }\SI{100}{\per \nano \meter})$ with a high count rate of up to $\SI{160}{\hertz}$ with a $\Delta q$ resolution of $\SI{\pm1.7}{\per\nano \meter}$ at $q=\SI{14}{\per\nano \meter}$. The sensitivity of this method in determining relaxation times is quantified and discussed. The Kohlrausch--Williams--Watts (KWW) model was used to extract relaxation times for glycerol ranging from $2$ to $\SI{600}{\nano \second}$. These relaxation times gives insight into the dynamics of the electron density fluctuations of glycerol as a function of temperature and momentum transfers.