The magnetic circular dichroism (MCD) of F2+ centers in KCl:SH- has be
en measured in absorption in the 1ssigma(g) --> 2p(y)pi(u) transitions
at 493 and 509 nm, with fields up to 5 T and in the temperature range
1.5 K < T < 77 K. Within the limit of detection, no MCD is observed i
n the near infrared transition 1ssigma(g) --> 2psigma(u) as well as in
both emissions 2ppi(u) --> 1ssigma(g) and 2psigma(u) --> 1ssigma(g).
The optical detection of EPR in the F2+ ground state presents an isotr
opic single band with g = 1.965 +/- 0.007. The spin-lattice relaxation
measured at H = 0.32 T is typical of a direct process T-1 = 4.3 x 10(
-2_ coth (gmu(B)H/2k(B)T). The spectral variation of the MCD is calcul
ated using perturbation theory to first order. The Hamiltonian include
s the spin-orbit interaction in the 2ppi(u) excited state and the orbi
tal molecular wave functions are obtained by a linear combination of 1
s and 2p atomic orbitals. The calculated MCD is in good agreement with
the observed one, for the spin-orbit interaction strength Pound(z) =
3.6 meV.