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Proceedings Paper

Bubble chamber for chemical analysis: a new concept
Author(s): Jerry H. Atencio; Xin Luo; Andrew W. McCown; E. Iain McCreary; Robert K. Sander
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Paper Abstract

A new technique for the detection of trace concentrations of molecules in solution has been developed. This system utilizes the amplification characteristics of a bubble chamber in which energy deposition from laser absorption is monitored. In the experimental set-up, a trace quantity of solute is introduced into liquid propane that is contained in a small (10 ml) stainless steel cell at 120 psi. The propane is superheated by sudden reduction of the cell pressure. Before wall nucleated boiling occurs, target solute molecules are energized by a laser pulse. Absorption of pump laser energy results in the formation of nucleation centers which develop into bubbles and which in turn are detected by CCD camera. Preliminary experiments with crystal violet used as a test absorber have demonstrated detection sensitivity of 10 parts per trillion (ppt).

Paper Details

Date Published: 7 April 1995
PDF: 7 pages
Proc. SPIE 2385, Advanced Optical Methods for Ultrasensitive Detection, (7 April 1995); doi: 10.1117/12.206443
Show Author Affiliations
Jerry H. Atencio, Los Alamos National Lab. (United States)
Xin Luo, Los Alamos National Lab. (United States)
Andrew W. McCown, Los Alamos National Lab. (United States)
E. Iain McCreary, Los Alamos National Lab. (United States)
Robert K. Sander, Los Alamos National Lab. (United States)

Published in SPIE Proceedings Vol. 2385:
Advanced Optical Methods for Ultrasensitive Detection
Bryan L. Fearey, Editor(s)

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