scholarly journals Very Low-Frequency Broadband Electron Paramagnetic Resonance Spectroscopy of Metalloproteins

2021 ◽  
Vol 125 (15) ◽  
pp. 3208-3218
Author(s):  
Wilfred R. Hagen
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Electron Paramagnetic Resonance Spectroscopy ◽  
Low Frequency ◽  
Resonance Spectroscopy ◽  
Paramagnetic Resonance ◽  
Very Low Frequency ◽  
Electron Paramagnetic

scholarly journals Mapping Pigments in a Painting with Low Frequency Electron Paramagnetic Resonance Spectroscopy

Heritage ◽  
2021 ◽  
Vol 4 (3) ◽  
pp. 1182-1192
Author(s):  
Shane McCarthy ◽  
Haley Wiskoski ◽  
Joseph P. Hornak
Keyword(s):  
Electron Paramagnetic Resonance ◽  
Electron Paramagnetic Resonance Spectroscopy ◽  
False Negative ◽  
Low Frequency ◽  
Resonance Spectroscopy ◽  
True Negative ◽  
Paramagnetic Resonance ◽  
Spectral Identification ◽  
Spatial Locations ◽  
Electron Paramagnetic

An electron paramagnetic resonance (EPR) mobile universal surface explorer (MOUSE) was recently introduced for noninvasively studying paramagnetic pigments in paintings. This study determined that the EPR MOUSE could map the spatial locations of four pigments in a simple impasto painting. Results from three spectral identification algorithms were examined to assess their ability to identify the pigments using an unsupervised approach. Resulting pigment maps are displayed as colorized images of the spatial distribution of the pigments. All three algorithms produced reasonable representations of the painting. The algorithms achieved excellent true positive, true negative, false positive, and false negative rates of ≥0.95, ≥0.98, ≤0.02, and ≤0.05, respectively, for the identification of the pigments. We conclude that the EPR MOUSE is suitable for accurately mapping the location of paramagnetic pigments in a painting.

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