Orthorhombic Electron Spin Resonance Spectrum of $U^{3 +}$ in Ca $F_{2}$

An orthorhombic spectrum of

U^{3 +}

in Ca

F_{2}

was measured. The orthorhombic

X

Y

axes are found to lie in the (110) plane and the

Z

axis perpendicular to these axes. The

X

axes are at ±(19±1)° with the [

1 \bar{1} 0

] direction. There are, in general, twelve inequivalent magnetic sites. The

g

factors corresponding to one set of axes are

g_{x} = 1.38 \pm 0.01

g_{y} = 2.85 \pm 0.02

, and

g_{z} = 2.94 \pm 0.01

. Various models explaining this spectrum are discussed. The most likely model is that of an interstitial

F^{-}

in the second-nearest neighbor position.

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Orthorhombic Electron Spin Resonance Spectrum ofU3+in CaF2