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<p><b>Impact ionization</b> is the process in a material by which one energetic <a href="page.php?w=charge_carrier">charge carrier</a> can lose energy by the creation of other charge carriers. For example, in <a href="page.php?w=semiconductor">semiconductor</a>s, an <a href="page.php?w=electron">electron</a> (or <a href="page.php?w=Electron_hole">hole</a>) with enough <a href="page.php?w=kinetic_energy">kinetic energy</a> can knock a bound electron out of its bound state (in the <a href="page.php?w=valence_band">valence band</a>) and promote it</p><p>
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