We report here on the implementation of arbitrary waveform generation (AWG) capabilities at approximately 200GHz into an Electron Paramagnetic Resonance (EPR) and Dynamic Nuclear Polarization (DNP) instrument platform operating at 7T. This is achieved with the integration of a 1GHz, 2 channel, digital to analog converter (DAC) board that enables the generation of coherent arbitrary waveforms at Ku-band frequencies with 1ns resolution into an existing architecture of a solid state amplifier multiplier chain (AMC). This allows for the generation of arbitrary phase- and amplitude-modulated waveforms at 200GHz with >150mW power. We find that the non-linearity of the AMC poses significant difficulties in generating amplitude-modulated pulses at 200GHz. We demonstrate that in the power-limited regime of omega110MHz) spin manipulation in incoherent (inversion), as well as coherent (echo formation) experiments. Highlights include the improvement by one order of magnitude in inversion bandwidth compared to that of conventional rectangular pulses, as well as a factor of two in improvement in the refocused echo intensity at 200GHz.
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Design and characterization of a W-band system for modulated DNP experiments
From The DNP-NMR Blog:
Design and characterization of a W-band system for modulated DNP experiments
Guy, M.L., L. Zhu, and C. Ramanathan, Design and characterization of a W-band system for modulated DNP experiments. J. Magn. Reson., 2015. 261: p. 11-18.
http://www.sciencedirect.com/science/article/pii/S1090780715002190
Journal Highlight: NMR quadrupole liouvillians for arbitrary spin: Exact symbolic expressions and perturbation solutions
Journal Highlight: NMR quadrupole liouvillians for arbitrary spin: Exact symbolic expressions and perturbation solutions
http://www.spectroscopynow.com/common/images/thumbnails/13dc0c363d3.jpgThe NMR of quadrupolar nuclei with half-integer spins, which is described by treating the quadrupole interaction with second-order perturbation theory, has been elaborated on by calculating the transitions directly without the requirement of knowing the operators and wavefunctions.
Read the rest at Spectroscopynow.com
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