Accession Number:

ADA242461

Title:

Initial Fire Suppression Reactions of Halons Phase 3. Molecular Beam Experiments Involving Halon Clusters

Descriptive Note:

Final rept. Jun 1988-Apr 1989

Corporate Author:

NEW MEXICO ENGINEERING RESEARCH INST ALBUQUERQUE

Report Date:

1990-09-01

Pagination or Media Count:

48.0

Abstract:

The system of Halon 1301 CF3Br and molecular oxygen O2 was carefully studied. Small, isolated molecular clusters of Halon 1301 and the oxygen-atoms, flame free radical precursor O2 were formed in a supersonic molecular beam, and chemical reactions were initiated within the clusters by dissociative photoionization. The fragments formed were identified by mass spectrometry, and the ionization and appearance potentials for many of the species in this binary system were determined. The most striking result is the inability to detect oxygenated fragments of dissociative photoionization of the complex CF3Br.O2. The results hold important mechanistic implications for the role of CF3Br in fire extinguishment and in guiding the search for alternative firefighting agents.

Subject Categories:

  • Safety Engineering

Distribution Statement:

APPROVED FOR PUBLIC RELEASE