Chemistry of the atmosphere by Murray J McEwan

By Murray J McEwan

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0, especially in the vicinity of band maxima, above 70 nm . At wavelengths below 66 nm the photoionization process gives rise to fluores­ cence from electronically excited N 2 + . 3 OZONE The most important feature of the absorption spectrum of 0 3 consists of the Hartley band and continuum between 200 and 300 nm. This system, which is shown in Fig. 2. 13, adjoins the Huggins bands, located between 300 and 350 nm, which are shown in Fig. 14. Ozone also absorbs in the visible region, in the weak Chappuis band which is illustrated in Fig.

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. 21 REFERENCES 35 60 50 E � Q) ""O 40 � ·;::; � 30 H orizon 6 4 2 1 20 1 0 -1 = sec x • Photodissociation coefficient ( s - 1 ) Fig. 22 Rate of photodissociation of H 2 0 2 , calculated by Nicolet, 1 6 as a function of altitude and solar zenith angle.

The- results, shown in Fig. 17, indicate that Lyman-a is responsible for most of the photodissociation occurring between 70 and 100 km. , , . 2 ozone 0( 3 P) 0( 1 0) 0( 1 S) Wavelength thresholds (nm) in the pbotodissociation of 02 ( 3:E, - ) 02 ( 1 6,) 0 2 ( 1 :E, + ) 02 ( 3:E. +) 3 02 ( I:. - ) 1 140 410 234 590 310 1 96 460 260 179 230 1 67 129 170 1 50 108 30 THE A TMOSPHERE AS A PHOTOCHEMICAL S YS TEM N E � c:: 0 -� Q) "' "' "' 1 0-10 e "' c:: 0 ·s. 0 <{ , o -1 9 Wave length ( n m ) Fig. 16 Absorption spectrum o f water above 120 nm.

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