Possible band termination in 99 Rh

High-spin states of ${}^{99}$Rh were studied through in-beam $\ensuremath{\gamma}$-ray spectroscopy by using the reaction ${}^{68}$Zn(${}^{37}$Cl, $\ensuremath{\alpha}$2$n$). The upper part of the band based on the ${g}_{9/2}$ proton orbital was rearranged in four parallel cascades. Negative parity was tentatively assigned for the side-band that previously had no parity assignment. This negative-parity band was interpreted as having the configuration of $\ensuremath{\pi}({g}_{9/2}{)}^{5}\ensuremath{\nu}[({d}_{5/2}{g}_{7/2}{)}^{3}({h}_{11/2})]$ and extended up to ${\frac{51}{2}}^{(\ensuremath{-})}$, which is possibly a terminating state. The band based on the ${p}_{1/2}$ proton orbital was observed up to ${\frac{29}{2}}^{\ensuremath{-}}$ and its property was compared with those of neighboring odd-$Z$ nuclei from the two different viewpoints, one of which is a weakly deformed soft rotor with spin alignments and the other is vibrational to rotational evolution along the band.