Solid-state Hadamard NMR spectroscopy: Simultaneous measurements of multiple selective homonuclear scalar couplings

Kakita, Veera Mohana Rao; Kupče, Ēriks; Jagadeesh, B.

doi:10.1016/j.jmr.2014.11.006

Cited by 12 publications

(2 citation statements)

References 44 publications

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“…[ 8 ] It has also been used more recently to record 13 C─ 15 N HETCOR spectra of U─ 13 C─ 15 N f‐MLF at ν R = 13 kHz [ 9 ] or to measure 13 C─ 13 C scalar couplings. [ 10 ] In this communication, we show how this Hadamard encoded acquisition can also be used to record 13 C─ 13 C 2‐D HOMCOR spectra at the much higher spinning speed of ν R = 62.5 kHz.…”

Section: Introductionmentioning

confidence: 99%

Hadamard acquisition of ¹³C–¹³C 2‐D correlation NMR spectra

Paluch

Kupče

Trébosc

et al. 2019

Magnetic Reson in Chemistry

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We show that a multiselective excitation with Hadamard encoding is a powerful tool for 2-D acquisition of 13 C─ 13 C homonuclear correlations. This method is not designed to improve the sensitivity, but rather to reduce the experiment time, provided there is sufficient sensitivity. Therefore, it allows fast acquisition of such 2-D spectra in labeled molecules. The technique has been demonstrated using a U─ 13 C─ 15 N histidine hydrochloride monohydrate sample allowing each point of the build-up curves of the 13 C─ 13 C cross-peaks to be recorded within 4 min 35 s, which is very difficult with conventional methods. Using the U─ 13 C─ 15 N f-MLF sample, we have demonstrated that the method can be applied to molecules with 14 13 C resonances with a minimum frequency separation of 240 Hz.

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Section: Introductionmentioning

confidence: 99%

Hadamard acquisition of ¹³C–¹³C 2‐D correlation NMR spectra

Paluch

Kupče

Trébosc

et al. 2019

Magnetic Reson in Chemistry

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“…8 NMR spectrometers are also used to generate selective, multifrequency pulses for experiments with multi-spin systems, e.g., Hadamard spectroscopy and quantum computation. 9,10 To create such complex pulses for EPR experiments, spectrometers capable of generating arbitrary waveform pulses have been developed, mostly at X band frequencies for experiments at various temperatures. [11][12][13][14][15][16][17][18][19][20] Low temperatures are particularly useful to reduce thermal noise of microwave components and increase thermal spin polarization, which improve signal-to-noise ratio (SNR).…”

Section: Introductionmentioning

confidence: 99%

A Ku band pulsed electron paramagnetic resonance spectrometer using an arbitrary waveform generator for quantum control experiments at millikelvin temperatures

Yap

Tabuchi

Negoro

et al. 2015

Review of Scientific Instruments

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We present a 17 GHz (Ku band) arbitrary waveform pulsed electron paramagnetic resonance spectrometer for experiments down to millikelvin temperatures. The spectrometer is located at room temperature, while the resonator is placed either in a room temperature magnet or inside a cryogen-free dilution refrigerator; the operating temperature range of the dilution unit is from ca. 10 mK to 8 K. This combination provides the opportunity to perform quantum control experiments on electron spins in the pure-state regime. At 0.6 T, spin echo experiments were carried out using γ-irradiated quartz glass from 1 K to 12.3 mK. With decreasing temperatures, we observed an increase in spin echo signal intensities due to increasing spin polarizations, in accordance with theoretical predictions. Through experimental data fitting, thermal spin polarization at 100 mK was estimated to be at least 99%, which was almost pure state. Next, to demonstrate the ability to create arbitrary waveform pulses, we generate a shaped pulse by superposing three Gaussian pulses of different frequencies. The resulting pulse was able to selectively and coherently excite three different spin packets simultaneously-a useful ability for analyzing multi-spin system and for controlling a multi-qubit quantum computer. By applying this pulse to the inhomogeneously broadened sample, we obtain three well-resolved excitations at 8 K, 1 K, and 14 mK.

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Hadamard Homonuclear Broadband Decoupled TOCSY NMR: Improved Efficacy in Detecting Long‐range Chemical Shift Correlations

Kakita

Hosur

2016

ChemPhysChem

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The importance of Hadamard encoding pulses in one-dimensional pure shift yielded by the chirp excitation version of selective total correlation spectroscopy (1D PSYCHE-TOCSY) experiments is discussed for chemical-shift analysis of complex natural products at ultrahigh resolution. Herein, we adapted H Hadamard matrices to 1D PSYCHE-TOCSY and observed an overall circa square root of n-fold enhancement in the signal-to-noise (S/N) ratio when compared to conventional 1D PSYCHE-TOCSY recorded by refocusing only one spin at a time. This enhancement in S/N facilitates the observation of very weak long-range chemical-shift correlations from Hadamard-encoded PSYCHE-TOCSY (HE-PSYCHE-TOCSY). The proposed method will have a significant impact on structure determination of complex isolated/ synthetic natural products.

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Solid-state Hadamard NMR spectroscopy: Simultaneous measurements of multiple selective homonuclear scalar couplings

Cited by 12 publications

References 44 publications

Hadamard acquisition of ¹³C–¹³C 2‐D correlation NMR spectra

Hadamard acquisition of ¹³C–¹³C 2‐D correlation NMR spectra

A Ku band pulsed electron paramagnetic resonance spectrometer using an arbitrary waveform generator for quantum control experiments at millikelvin temperatures

Hadamard Homonuclear Broadband Decoupled TOCSY NMR: Improved Efficacy in Detecting Long‐range Chemical Shift Correlations

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Solid-state Hadamard NMR spectroscopy: Simultaneous measurements of multiple selective homonuclear scalar couplings

Cited by 12 publications

References 44 publications

Hadamard acquisition of 13C–13C 2‐D correlation NMR spectra

Hadamard acquisition of 13C–13C 2‐D correlation NMR spectra

A Ku band pulsed electron paramagnetic resonance spectrometer using an arbitrary waveform generator for quantum control experiments at millikelvin temperatures

Hadamard Homonuclear Broadband Decoupled TOCSY NMR: Improved Efficacy in Detecting Long‐range Chemical Shift Correlations

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Hadamard acquisition of ¹³C–¹³C 2‐D correlation NMR spectra

Hadamard acquisition of ¹³C–¹³C 2‐D correlation NMR spectra