Abstract
The number of ion pairs produced by the total ablation of iron particles in air and argon was measured as a function of particle velocity. Micron-size iron particles of known mass and velocity were injected into a gas target chamber and the resulting ionization collected with a parallel-plate ionization chamber. Initial velocities of the particles ranged from 20 km/sec to 45 km/sec. The probability of ionization, , for an iron particle in argon was found to be p = 2.75 X 13, where 2' is the particle velocity in meters per second. The probability of ionization of an iron particle in air was found to be p = 2.60 X 10- 2' 12, with V in meters per second.
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