  The coalescence of a stellar-mass compact object together with an
intermediate-mass black hole, also known as intermediate-mass-ratio inspiral,
is usually not expected to be a viable gravitational wave source for the
current ground-based gravitational wave detectors, due to the generally lower
frequency of such source. In this paper, we adopt the effective-one-body
formalism as the equation of motion, and obtain the accurately calculated
gravitational waveforms by solving the Teukolsky equation in frequency-domain.
We point out that high frequency modes of gravitational waves can be excited by
large eccentricities of intermediate-mass-ratio inspirals. These high frequency
modes can extend to more than 10 Hz, and enter the designed sensitive band of
Advanced LIGO and Advanced Virgo. We propose that such kind of highly eccentric
intermediate-mass-ratio inspirals could be feasible sources and potentially
observable by the ground-based gravitational wave detectors, like the Advanced
LIGO and Advanced Virgo.
