We report the observation of light-induced electron spin resonance (LESR) i
n amorphous hydrogenated germanium. Two new lines with zero crossings near
g=2.01 and g=2.03 were detected and ascribed to electrons and holes in the
conduction- and valence-band-tail states, respectively. The ratio between t
he LESR spin densities of both lines is approximately one, suggesting the a
bsence of spin pairing, charge defect creation, or LESR of dangling bonds.
The growth and decay spectra exhibit dispersive behavior with a dispersion
parameter similar to 0.5. The decay spectrum is best fit assuming bimolecul
ar recombination. The LESR spin density depends weakly on the photogenerati
on rate as a sublinear power law. (C) 1999 American Institute of Physics. [
S0003-6951(99)03925-X].