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By Murray J McEwan

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Phys. , 16, 225, 638 (1948). 1 Introduction In this chapter we consider the various techniques that can be used to obtain experimental information about the chemistry of the atmosphere. Investigation of the troposphere presents relatively few problems because the whole region is accessible to the experimenter, and the photochemical processes that occur are fairly easy to simulate in the laboratory. Thus our main concern will be the experimental procedures used to obtain strato­ spheric, mesospheric and ionospheric data.

Gas entering at A is partially dissociated by a discharge inside the microwave cavity M, before flowing down the reaction tube R and out to the pump at P. The stable reactant enters at B, flowing through the flexible tube T to enter the reaction tube through the jet J . The jet J can be moved along the axis of the reaction tube by turning the handle H . Guide tubes G keep it positioned in the centre of the reaction tube. The small sampling leak L leads, via the mass spectrometer ion source S, to a diffusion pump D.

4 x x • Increased by factors of 1 03 and 1 05 for disturbed sun and class 3 flare respectively. t Increased by at least a factor of 50 for disturbed sun. t Increased by a factor of - 7 for disturbed sun . � - ..... 0- 1 02 x t I ntensity ( W m - 2 nm - 1 Fig. 6 ea. 0 . 1 nm wide 1 2 1 . 6 nm Line profile of solar Lyman-ix at 1 20 km. 1 . Below 190 nm the emission is almost entirely in the form of atomic lines ; the black-body continuum is undetectable below 1 50 nm . 6 nm in the vacuum ultraviolet, whose total intensity is typically 5 x 10 - 3 W m - 2 .

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