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In page Pentaerythritol tetranitrate:
"PETN can be initiated by a laser.[4] A pulse with duration of 25 nanoseconds and 0.5–4.2 joules of energy from a Q-switched ruby laser can initiate detonation of a PETN surface coated with a 100 nm thick aluminium layer in less than half of a microsecond.[citation needed]
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