SABRE Enhancement with Oscillating Pulse Sequences: Symmetry Reduces Robustness

GENERAL INFORMATION
Principal investigator: Warren S Warren, PhD
Institution- Duke University Department of Chemistry, Physics, Biomedical Engineering and Radiology 
Address- 124 Science Drive, 2217 French Family Science Center, Duke Box 90346, Durham, NC 27708-0346
Email- warren.warren@duke.edu

Primary Date Collector: Xiaoqing Li
Institution- Duke University Department of Physics
Address- 124 Science Drive, 2217 French Family Science Center, Duke Box 90346, Durham, NC 27708-0346
Email- xiaoqing.li@duke.edu

Co-investigators: Jacob R Lindale, PhD and Shannon L Eriksson

Dates of data collection: 07/09/2021-07/29/2021

Location of data collection: Duke University (Durham, NC)

DATA AND FILE OVERVIEW
The accompanying data sets include the NMR spectra collected for a variety of oscillating pulse sequences. Every file logged will have 3 columns: Column 1 gives oscillating frequency in Hz, column 2 gives the real component of the spectrum, and column 3 gives the imaginary component of the spectrum. All data are collected using a solution of 4.4mM Ir(IMes) catalyst, 50mM 15N-acetonitrile, and 25mM pyridine. The spectra were taken from a 1T 15N Magritek after 60s of exposure to the pulse sequence.

Folder: SquarePulse
070921_Amp_18V_offset_0mV_T _XXXX - Variables Amp and offset were held constant, and the pulse period was varied. The oscillating pulse used here is a square pulse with pulse Amplitude 10uT (18V applied by AWG) and offset -0.13uT (-1mV). The variable pulse length was specified in the filepath (format: 070921_Amp_18V_offset_0mV_T_XXXX, where XXXX indicates the pulse period in micro-seconds).

070921_Amp_18V_offset_XXXX_T_22.7ms - Variables Amp and T were held constant, and the offset was varied. The oscillating pulse used here is a square pulse with pulse Amplitude 10uT (18V applied by AWG) and period 22.7ms. The variable pulse length was specified in the filepath (format: 070921_Amp_18V_offset_XXXX_T_22.7ms, where XXXX indicates the offset in micro-Voltage).

Folder: SineWave
072321_TXXXX_offset45mV_sinWave_19.3V - The oscillating pulse used is a sine wave with pulse Amplitude being fixed at 50uT (19.3V applied by AWG) and offset being maintained at -0.13uT (45mV). The variable pulse period was specified in the filepath (format: 
072321_TXXXX_offset45mV_sinWave_19.3V, where XXXX indicates the pulse period in micro-seconds).

072321_T3.50ms_offsetXXXX_sinWave_19.3V - The oscillating pulse used is a sine wave with pulse Amplitude being fixed at 50uT (19.3V applied by AWG) and pulse peirod maintained at 3.5ms. The variable offset was specified in the filepath (format: 072321_T3.50ms_offsetXXXX_sinWave_19.3V, where XXXX indicates the offset in micro-Voltage).

Folder: ChirpedWave
072921_ChirpPulse_B_XXXX_B0_43mV - The oscillating pulse used is a chirped wave with offset being fixed at -0.13uT (43mV applied by AWG). The variable pulse amplitude was specified in the filepath (format: 072921_ChirpPulse_B_XXXX_B0_43mV, where XXXX indicates the amplitude in Voltage).

072921_ChirpPulse_B0_XXXX - The oscillating pulse used is a chirped wave with offset being fixed at -0.13uT (43mV applied by AWG). The variable pulse amplitude was specified in the filepath (format: 072921_ChirpPulse_B_XXXX_B0_43mV, where XXXX indicates the offset in micro-Voltage).

Folder: RampPulse
072921_Ramp_48mV_XXXX - The oscillating pulse used is a ramp pulse with offset being fixed at -0.13uT (48mV applied by AWG) and the pulse period being maintained at 20ms. The variable pulse amplitude was specified in the filepath (format: 072921_Ramp_48mV_XXXX, where XXXX indicates the amplitude in Voltage).

072921_Ramp_48mV_XXXX - The oscillating pulse used is a ramp pulse with offset being fixed at -0.13uT (48mV applied by AWG) and the pulse amplitude being maintained at 50 uT (20V applied by AWG). The variable pulse period was specified in the filepath (format: 072921_Ramp_48mV_XXXX, where XXXX indicates the period in micro-seconds).