By Murray J McEwan
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New York, 1 966). has so far defied more than a partial analysis. 2 0 Above 400 nm the bands consist of many sharp rotational lines ; below 370 nm the bands are generally diffuse because of predissociation. The theoretical dissociation limit is 399 nm. 8 nm; absorption cross sections in this region are typically 2 x 10 - 1 7 cm 2 • Photodissociation coefficient ( s - 1 ) Rate of photodissociation of methane by Lyman-ix, calculated by Nicolet, 1 6 as a function of altitude and solar zenith angle X· Fig.
19. , except in the vicinity of sharp bands where the results of Nakata et al. ::. 2 0 70 60 50 40 30 20 Wavelength ( n m ) Fig. 2 . 1 8 Absorption cross sections for H2 below 70 nm. they used a narrower instrumental bandwidth. 6 nm, and the associated ionization continuum appears smooth from this limit down to 84 nm, after which there is a banded region extending to 68 nm, followed by a further smooth continuum which has been observed as far as 10 nm . The ionization yield is essentially unity below 70 nm ; between 70 and 90 nm it fluctuates slowly between limits of about 50 and 90 %.
6 nm, and the associated ionization continuum appears smooth from this limit down to 84 nm, after which there is a banded region extending to 68 nm, followed by a further smooth continuum which has been observed as far as 10 nm . The ionization yield is essentially unity below 70 nm ; between 70 and 90 nm it fluctuates slowly between limits of about 50 and 90 %. Photoionization is accompanied at short wavelengths by dissociation to ionic and neutral fragments, and by the production of electronically excited C0 2 + , which gives rise to strong fluorescence in the near ultraviolet between 280 and 400 nm.
