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One of the most sensitive gas
chromatographic detector for halogen-containing compounds like
chlorofluorocarbons. James Lovelock's early work with this detector led to the
discovery that anthropogenic chlorofluorocarbons used most heavily in the
Northern hemisphere were very long-lived and therefore well-mixed throughout the
troposphere. Later work by Rowland and Molina suggested that CFCs also diffused
into the stratosphere where their chlorine atoms could by freed by
photolysis-CFC bond breaking by UV light. The result of this is the destruction
of ozone molecules in the important ozone layer of the stratosphere.
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