  Multi-frequency electron spin resonance (ESR) transmission spectra have been
measured as function of temperature and magnetic field on single crystals of
the quasi-one-dimensional spin-1 chain compound SrNi2V2O8 in the GHz frequency
range. Magnetic resonance modes above 50 K have been observed with an effective
g-factor of 2.24 at 100 K. Below 30 K, intra-triplet excitations have been
observed in the ESR spectra, which reveal the presence of single-ion anisotropy
with D = -0.29 meV.
