  Hydrogen dissociation is an unwanted competing pathway if a torsional motion
around the C=C double bond in a chiral fluoroethylene derivative, namely
(4-methylcyclohexylidene) fluoromethane (4MCF), is to be achieved. We show that
the excited state H-dissociation can be drastically diminished on timescales
long enough to initiate a torsion around the C=C double bond using the
non-resonant dynamic Stark effect. Potential energy curves, dipoles and
polarizabilities for the regarded one-dimensional reaction coordinate are
calculated within the CASSCF method. The influence of the excitation and the
laser control field is then simulated using wavepacket dynamics.
