Everyday interactive programs for users of electron magnetic resonance

The package consists of several complementary programs devoted to help researchers and students to treat experimental spectra of Electron Paramagnetic Resonance, EPR, to simulate observed spectra and their angular dependences, to obtain spectroscopic characteristics of paramagnetic spices, and to prepare representative figures for publication.

The programs were developed in closed collaboration with experimenters in the labs where main manpower is undergraduate and graduate students. They have simple and convenient interface, are flexible enough to solve most of everyday tasks, and do not require additional programming. A balanced combination of exact numerical diagonalization of spin-Hamiltonian matrices and perturbation theory allowed creating algorithms, which are fast enough to calculate spectra of the Gd³⁺ or Mn²⁺ in a few minutes using conventional desktops and laptops.Since the first distribution in 1992, the programs have been successfully used in dozen spectroscopic groups from different countries.

Fields.exe – to calculate energy levels and resonance magnetic fields, simulate spectra, and compare experimental and calculated angular dependencies.	FAIW.exe – to represent on one plot four-dimensional table of angular dependences of resonance magnetic field, line intensities and widths (Fields-Angles-Intensities-Widths dependencies), to compare observed and calculated dependencies, and to prepare the picture for publication.
View_spc.exe – to view and compare measured spectra, treat them (filtering, peak-picking…) and collect angular dependence of resonance line positions, intensities and widths in a file,	Params.exe – to determine spin-Hamiltonian parameters by fitting experimental data,
Cos_Eul.exe – to find principal values and directions of principal axes of general Cartesian and irreducible tensors of second rank.	These everyday programs can accelerate experimental data treatment, enhance trustworthiness of obtained results, improve accuracy of determined characteristics, and increase efficiency of conducted research in laboratories, which need in characterization of magnetic properties. Due to visual representation of calculation results, they can also be used for educational purposes.

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