Experiments on Collisional Grain Charging of Micron-sized Preplanetary Dust
T. Poppe, J. ü Blum, rgen, T. Henning;
ApJ, 2000, 533, 472
ABSTRACT:Collisions between micron-sized grains and larger objects with velocities up to several 10 m s-1 are believed to be an important
physical process in the solar nebula with respect to the preplanetary dust
aggregation.
Former collision experiments demonstrated that grain-target collisions of
micron-sized particles were marked by obvious electrostatic effects.
Among those
were the observation of particles which, after mechanical rebound,
returned to the target and finally stuck, and of particle deposition on targets
influenced by the presence of conducting materials.
Therefore, it is clear that
the dust aggregation process cannot adequately be described without
investigating collisional grain charging experimentally.
We present experiments
on the collisional grain charging of micron-sized grains impacting
target surfaces which, in contrast to former work, consist both of
nonconducting material and the experiments involving smaller particles than
before.
Collisional grain charging is stronger than previously discussed with respect to
preplanetary grains and should be considered concerning the preplanetary dust
aggregation, the formation of lightning in the solar nebula, and a coupling of
charged grains to magnetic fields.
KEYWORDS: accretion, accretion disks, ism: dust, extinction, methods: laboratory, solar system: formation
PERSOKEY:dust, size distribution, ,
CODE: poppe2000a