We described a versatile spectrometer designed for the study of dynamic nuclear polarization (DNP) at low temperatures and high fields. The instrument functions both as an NMR spectrometer operating at 212 MHz ((1)H frequency) with DNP capabilities, and as a pulsed-EPR operating at 140 GHz. A coiled TE(011) resonator acts as both an NMR coil and microwave resonator, and a double balanced ((1)H,...

Experimental. Elemental microanalyses were performed in the Analytical Laboratories of the University of Catania. 1H NMR spectra were recorded on a Varian Inova 500 spectrometer. Infrared spectra were recorded on a Perkin Elmer FTIR 1720 spectrometer as nujol mulls between NaCl plates. Thermogravimetric analyses were performed by using a Mettler Toledo TGA/SDTA 851. Weights of the samples were ...

General Methods Unless otherwise stated, reactions were performed in flame-dried glassware under argon atmosphere and using anhydrous solvents. All commercially obtained reagents were used as received unless otherwise noted. Thin layer chromatography (TLC) was performed using E. Merck silica gel 60 F254 precoated plates (0.25 mm). Visualization of the developed chromatogram was performed by UV,...

Optical nuclear magnetic resonance (ONMR) is a powerful probe of electronic properties in III-V semiconductors. Larmor-beat detection (LBD) is a sensitivity optimized, time-domain NMR version of optical detection based on the Hanle effect. Combining LBD ONMR with the line-narrowing method of POWER (perturbations observed with enhanced resolution) NMR further enables atomically detailed views of...

A NMR probe for low frequency and short recovery time is presented in this work. The probe contains the tuning circuit, diode expanders and quarter wavelength networks to protect the receiver from both the amplifier noise and the coil ringing following the transmitter power pulse. It also possesses a coil damper which is activated by of non active components. The probe performance shows a recov...

Background and Objectives: Zedo gum is exuded in three colours (white, yellow, and red) from Amygdalus scoparia. It is used in both food and non-food industries, as well as in traditional medicine. This study aimed to determine the physicochemical and rheological properties of Zedo gum. Materials and Methods: Zedo gum was collected in Sirjan and classified into three groups, based on colour ...