  We draw attention to the fact that the popular but unproven hypothesis of
shock-driven sonoluminescence is incompatible with the reported synchronicity
of the single bubble sonoluminescence (SBSL) phenomenon. Moreover, it is not a
necessary requirement, since we show that the sub-shock dynamic heating in gas
bubble cavitation can lead to conditions required to generate intense 100ps
light pulses. To wit we study the dynamics of the interior of a cavitating gas
bubble subject to conditions suitable for sonoluminescence. We explore
quantitatively the transfer of energy from the sound wave to the bubble
interior, the frequency of atomic collisions in the bubble, the limits of
quasi-stability of the non-linear bubble oscillations driven by an acoustical
field, and obtain the implied reaction time scales.
