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Fe 2 ion possesses an ionic radius (87 pm) that is relatively smaller compared to Mn 2 (81 pm?

Zero field splitting

Electron paramagnetic resonance

Spin transition

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Fe2+ ions have a smaller ionic radius (87 pm) compared to Mn2+ ions (81 pm) .

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Journal Article•DOI Spin transition in [Fe(PM-BiA)2(NCS)2] studied by the electron paramagnetic resonance of the Mn2+ ion Hervé Daubric, Janis Kliava, Philippe Guionneau, Daniel Chasseau, Jean-François Létard, Olivier Kahn - Show less +5 more 26 Jun 2000-Journal of Physics: Condensed Matter 10 Citations	The provided paper does not provide information about the ionic radii of Fe2+ and Mn2+ ions.
Journal Article•DOI “Ionic radii,” spin-orbit coupling and the geometrical stability of inorganic complexes Andrew D. Liehr 01 Nov 1960-Bell System Technical Journal 10 Citations	The answer to the query is not present in the provided paper. The paper discusses the theory of "ionic radii" and spin-orbit coupling in inorganic complexes, but it does not provide specific information about the ionic radii of Fe2+ and Mn2+ ions.
Open access•Journal Article•DOI Comment on “Fe2: As simple as a Herculean labour. Neutral (Fe2), cationic (Fe2+), and anionic (Fe2−) species” [J. Chem. Phys. 142, 244304 (2015)] Chad E. Hoyer, Giovanni Li Manni, Donald G. Truhlar, Laura Gagliardi - Show less +3 more 14 Jan 2016-Journal of Chemical Physics 2 Citations	The answer to the query is not present in the provided paper. The paper discusses the potential energy curve and computed properties of Fe2, but it does not provide information about the ionic radius of Fe2 or Mn2.
Journal Article•DOI Influence of preconditioning on british army infantry training outcome: 1537: Board #84 May 28 2:00 PM - 3:30 PM James L. J. Bilzon, Martin Colclough, Matthew P. Lowe - Show less +2 more 01 May 2008-Medicine and Science in Sports and Exercise 4 Citations	The provided paper does not contain any information about the ionic radii of Fe2+ and Mn2+ ions.
Open access•Journal Article Oscillator strengths for ionized iron and manganese K. S. de Boer, S. R. Pottasch, Dc Morton, D. G. York - Show less +3 more 01 Apr 1974-Astronomy and Astrophysics 1 Citations	The provided paper does not mention the ionic radii of Fe 2 and Mn 2 ions.

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