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<p>carbon ion (three electrons already removed) requires about 65&nbsp;<a href="page.php?w=Electronvolt">eV</a>. Such electrons are more tightly bound than typical <a href="page.php?w=valence_electrons">valence electrons</a>. The existence of multicharged positive ions is only possible in a hot dense <a href="page.php?w=plasma_%28physics%29">plasma</a>. Alternatively, the free electrons and ions may be generated temporarily and instantaneously by the intense <a href="page.php?w=electric_field">electric field</a> of a <a href="page.php?w=harmonic_generation">very-high-harmonic</a></p><p>
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