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High Frequency electron paramagnetic resonance has been used to observe themagnetic dipole, $\Delta$ M$_s$ = $\pm$ 1, transitions in the $S = 9$ excitedstate of the single molecule magnet Fe$_8$Br$_8$. A Boltzmann analysis of themeasured intensities locates it at 24 $\pm$ 2 K above the $S = 10$ groundstate, while the line positions yield its magnetic parameters D = -0.27 K, E =$\pm$0.05 K, and B$_4^0$ = -1.3$\times$ 10$^{-6}$ K. D is thus smaller by 8%and E larger by 7% than for $S = 10$. The anisotropy barrier for $S = 9$ isestimated as 22 K,which is 25% smaller than that for $S = 10$ (29 K). Thesedata also help assign the spin exchange constants(J's) and thus provide a basisfor improved electronic structure calculations of Fe$_8$Br$_8$.Comment: 7 pages, Figs included in text, submitted to PR

physical review. b, condensed matter

Characterization of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>S</mml:mi><mml:mo>=</mml:mo><mml:mn>9</mml:mn><mml:mn /></mml:math>excited state in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Fe</mml:mi></mml:mrow><mml:mrow><mml:mn>8</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Br</mml:mi></mml:mrow><mml:mrow><mml…

Characterization of theS=9excited state inFe8Br