Recent progress in IR laser chemistry is reviewed with stress on the c
onceptual background and experimental advances from our research group
. In particular we discuss various experimental schemes in laser chemi
stry as related to thermal reactions and ordinary photochemistry, and
new results in time and frequency resolved kinetic IR spectroscopy at
the limit defined by the uncertainty relation. The recent detection of
hyperfine effects in IR laser chemistry is reviewed as well as nonlin
ear intensity dependence over many orders of magnitude including obser
vations of nonlinear intensity fall-off and IR laser ionization of mol
ecules. An outlook is presented on different time scales for intramole
cular processes and the resulting future possibilities of IR laser che
mical reaction control.