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Title: Generation of cavitation luminescence by laser-induced exothermic chemical reaction

Absorption of high power laser radiation by aqueous carbon suspensions is known to result in the formation of highly compressed bubbles of hydrogen and carbon monoxide through the endothermic carbon-steam reaction. The bubbles expand rapidly, overreaching their equilibrium diameter, and then collapse tens to hundreds of microseconds after formation to give a flash of radiation. Here we report on the effects of laser-initiated exothermic chemical reaction on cavitation luminescence. Experiments with hydrogen peroxide added to colloidal carbon suspensions show that both the time of the light flash following the laser pulse and the intensity of luminescence increase with hydrogen peroxide concentration, indicating that large, highly energetic gas bubbles are produced. Additional experiments with colloidal carbon suspensions show the effects of high pressure on the luminescent intensity and its time of appearance following firing of the laser.
Authors:
;  [1]
  1. Department of Chemistry, Brown University, Providence, Rhode Island 02912 (United States)
Publication Date:
OSTI Identifier:
22218243
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 114; Journal Issue: 6; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ABSORPTION; BUBBLES; CARBON; CARBON MONOXIDE; CAVITATION; CHEMICAL REACTIONS; CONCENTRATION RATIO; HYDROGEN; HYDROGEN PEROXIDE; LASER RADIATION; LASERS; LUMINESCENCE; SUSPENSIONS; VISIBLE RADIATION