Load two 1D NMR spectra in Kea format

In this example we demonstrate how to import two ODNP-enhanced NMR spectra, one recorded with a microwave power of 0 W (off-signal) and one with a microwave power of 2 W (on-signal). The spectra are recorded using a Magritek Kea system.

The example script has three different sections:

1. Load and Process Off-Signal

2. Load and Process On-Signal

3. Create a Figure and Plot On/Off Spectra

Make sure to start with importing DNPLab

import dnplab as dnp

Load and Process Off-Signal

The next section demonstrates how the FID is imported into DNPLab and processed. Processing involves removing any DC offset, followed by a 15 Hz linewidth apodization, prior to performing the Fourier transformation.

########## OFF Signal (P = 0 W) ##########
data_off = dnp.load("../../data/prospa/10mM_TEMPO_Water/1Pulse_20200929/35/data.1d")

data_off = dnp.remove_background(data_off)
data_off = dnp.apodize(data_off, lw=15)
data_off = dnp.fourier_transform(data_off)

Load and Process ON-Signal

Importing the on-signal involves the same steps as importing the off-signal. Once processed the data is copied to the results buffer 'onSignal'.

########## ON Signal (P = 2 W) ##########
data_on = dnp.load("../../data/prospa/10mM_TEMPO_Water/1Pulse_20200929/51/data.1d")

data_on = dnp.remove_background(data_on)
data_on = dnp.apodize(data_on, lw=15)
data_on = dnp.fourier_transform(data_on)

Plot Microwave On/Off DNP Spectra

First plot spectra individually

sampleTag = "10 mM TEMPO in Water"

dnp.plt.figure()
dnp.fancy_plot(data_on, title=sampleTag + ", MW On Spectrum")

dnp.plt.figure()
dnp.fancy_plot(data_off, title=sampleTag + ", MW Off Spectrum")
dnp.plt.show()

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Next plot both spectra in the same figure

dnp.plt.figure()
dnp.fancy_plot(data_on, xlim=[-20, 20])
dnp.fancy_plot(data_off * 50, xlim=[-20, 20])
dnp.plt.title(sampleTag + ", MW ON/OFF(*50)")
dnp.plt.tight_layout()
dnp.plt.show()