Direct Observation of CIO from Chlorine Nitrate Photolysis

Chlorine nitrate photolysis has been investigated with the use of a molecular beam technique. Excitation at both 248 and 193 nanometers led to photodissociation by two pathways, CIONO$_2$ → CIO + NO$_2$ and CIONO$_2$ → CI + NO$_3$, with comparable yields. This experiment provides a direct measuremen...

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Bibliographic Details
Published in:Science (American Association for the Advancement of Science) 1992-11, Vol.258 (5086), p.1342-1345
Main Authors: Minton, Timothy K., Nelson, Christine M., Moore, Teresa A., Okumura, Mitchio
Format: Article
Language:English
Subjects:
Air ionization
Angular distribution
Atomic and molecular physics
Atoms
Calibration
Chemistry
Chlorine
Exact sciences and technology
Flight time
Laboratories
Laser beams
Lasers
Molecular beams
Molecular properties and interactions with photons
Nitrates
Personality
Photolysis
Photon interactions with molecules
Physics
Scientific Concepts
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Summary:Chlorine nitrate photolysis has been investigated with the use of a molecular beam technique. Excitation at both 248 and 193 nanometers led to photodissociation by two pathways, CIONO$_2$ → CIO + NO$_2$ and CIONO$_2$ → CI + NO$_3$, with comparable yields. This experiment provides a direct measurement of the CIO product channel and consequently raises the possibility of an analogous channel in CIO dimer photolysis. Photodissociation of the CIO dimer is a critical step in the catalytic cycle that is presumed to dominate polar stratospheric ozone destruction. A substantial yield of CIO would reduce the efficiency of this cycle.
ISSN:0036-8075
1095-9203
DOI:10.1126/science.258.5086.1342