EPR of Co

1) Hamiltonian
: ?? ?????? ??? ????? ?? ?? ???? ???? ???
H = ¦ÂSgH+ SAI + D[Sz2 - 1/3S(S+1)+E/D(Sx2-Sy2)
¢Ù electron zeeman interaction
: ??? ???? ??? ??? ???? ???? ??? ???? ???? ????

? ¦Â : Bohr magneton (9.2741¡Á10-21erg?Gauss-1)
S : spin operation
g : g - factor (hv/¦ÂB0)
H : applied field strength

¢Ú Hyperfine and superhyperfine interaction
: ????? ??? ??? ????
* S?A?I ? ??? ????? ??? ??
- Hyperfine interaction : Electron Spin? Nuclear Spin ??? Interaction
- Superhyperfine interaction : ??? d??? ??? ??? ?spin ??? interaction

? A(=hfc) : hyperfine coupling constant
I : nuclear spin
S : electron spin

¢Û electron spin - electron spin interaction
: ???? 2? ??? ? spin? ??? ???? ( s > 1/2 )

? H = D[Sz2 - 1/3S(S+1)+E/D(Sx2-Sy2)]+ g0¦ÂSH
D : Zero-field splitting(ZFS) parameter
E/D: rhombicity (the ratio between D, the axial splitting parmeter, and E, the thombic splitting parameter, at zerofield)
- minimum : E/D = 0 ( an axial system )
- maximum : E/D = 1/2 ( an rhombic system )