A Simulation Independent Analysis of Single- and Multi-Component cw ESR Spectra

Aritro Sinha Roy, Boris Dzikovski, Dependu Dolui, Olga Makhlynets, Arnab Dutta, Madhur Srivastava

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


The accurate analysis of continuous-wave electron spin resonance (cw ESR) spectra of biological or organic free-radicals and paramagnetic metal complexes is key to understanding their structure–function relationships and electrochemical properties. The current methods of analysis based on simulations often fail to extract the spectral information accurately. In addition, such analyses are highly sensitive to spectral resolution and artifacts, users’ defined input parameters and spectral complexity. We introduce a simulation-independent spectral analysis approach that enables broader application of ESR. We use a wavelet packet transform-based method for extracting g values and hyperfine (A) constants directly from cw ESR spectra. We show that our method overcomes the challenges associated with simulation-based methods for analyzing poorly/partially resolved and unresolved spectra, which is common in most cases. The accuracy and consistency of the method are demonstrated on a series of experimental spectra of organic radicals and copper–nitrogen complexes. We showed that for a two-component system, the method identifies their individual spectral features even at a relative concentration of 5% for the minor component.

Original languageEnglish (US)
Article number112
Issue number5
StatePublished - May 2023


  • ESR spectral analysis
  • hyperfine decoupling
  • resolution enhancement
  • simulation-free spectra analysis
  • wavelet packet transform

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Chemistry (miscellaneous)
  • Materials Chemistry


Dive into the research topics of 'A Simulation Independent Analysis of Single- and Multi-Component cw ESR Spectra'. Together they form a unique fingerprint.

Cite this