  Laser-induced breakdown spectroscopy (LIBS) show enhancement in its signal,
when the laser-induced plasma is confined/decelerated under the effect of an
external steady magnetic field or in a small cavity. An enhancement in LIBS
signal has been observed ~2 times in the case of magnetic confinement.
Combination of magnetic and spatial confinement provide enhancement by an order
of magnitude. Theoretical analysis of the decelerated plasma has been found in
agreement with the experimental observations. The enhancement in LIBS signal is
found dependent on the efficiency of plasma confinement as well as on the time
duration of laser. The saturation in LIBS signal at higher laser intensity is
found correlated with electron-ion collision frequency as well as on the
dynamics and instability of plasma plume. Possibility of further enhancement in
emission has also been discussed.
