By focusing a short laser pulse in a liquid a single bubble can be
generated at a well-defined position and time by optical breakdown. This
method has been utilized extensively to study bubble dynamics at
different conditions, but is also used, e.g. in laser-induced breakdown
spectroscopy for elemental analysis or in laser ophtalmology. In this
work the coupled hydrodynamic and chemical evolution in a
laser-generated bubble in water are investigated numerically by means of
molecular dynamics simulations.

Two different situations are considered: (i) a transient bubble that
decays after a few afterbounces, and (ii) a bubble seeded in an
ultrasonic field, that transforms into a stably oscillating bubble. The
spatial and temporal evolution of temperature, pressure and species
concentrations in the collapsing bubble are given for a number of cases
with different laser energy and acoustic driving levels.

Particular attention is paid to the thermodynamics and chemodynamics
during the first bubble collapse and the associated chemical yields. For
case (ii), the chemical evolution of the bubble over several cycles is
considered.

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1. Translation of bubbles subject to weak acoustic forcing and error in decoupling from volume oscillations
2. Fundamentals in cavitation, sonochemistry and sonoluminescence: Report on WG9 activity