  We analyze the frequencies of three known roAp stars, TIC 96315731, TIC
72392575, and TIC 318007796, using the light curves from the Transiting
Exoplanet Survey Satellite (TESS). For TIC 96315731, the rotational and
pulsational frequencies are $0.1498360\,\mathrm{d}^{-1}$ and
$165.2609\,\mathrm{d}^{-1}$, respectively. In the case of TIC 72392575, the
rotational frequency is $0.25551\,\mathrm{d}^{-1}$. We detect a quintuplet of
pulsation frequencies with a center frequency of $135.9233\,\mathrm{d}^{-1}$,
along with two signals within the second pair of rotational sidelobes of the
quintuplet separated by the rotation frequency. These two signals may
correspond to the frequencies of a dipole mode. In TIC 318007796, the
rotational and pulsational frequencies are $0.2475021\,\mathrm{d}^{-1}$,
$192.73995\,\mathrm{d}^{-1}$, and $196.33065\,\mathrm{d}^{-1}$, respectively.
Based on the oblique pulsator model, we calculate the rotation inclination
$\left( i \right)$ and magnetic obliquity angle $\left( \beta \right)$ for the
stars, which provides the geometry of the pulsation modes. Combining the phases
of the frequency quintuplets, the pulsation amplitude and phase modulation
curves, and the results of spherical harmonic decomposition, we conclude that
the pulsation modes of frequency quintuplets in TIC 96315731, TIC 72392575, and
TIC 318007796 correspond to distorted dipole mode, distorted quadrupole mode,
and distorted dipole mode, respectively.
