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Photodissociation of polyatomic molecules by vacuum-uv light often results in the formation of electronically excited diatomic molecular fragments. Based on this, instruments that measure mixing ratios or densities of selected polyatomic species in the stratosphere and higher troposphere can be constructed. This is demonstrated by an instrument to detect and measure stratospheric water mixing ratios utilizing H(2)O photodissociation by Ly alpha (1216 A) light and detecting OH(A(2)J(+)X(2)Pi) emission. Also, detectors for H(2)O(2), HNO(3), and NO(2) are discussed.
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Kley et al. (1978) studied this question.
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