By H.S.W. Massey (Eds.)
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Additional info for Applied Atomic Collision Physics. Atmospheric Physics and Chemistry
6 nm. This is very important for the production of the D region, and is discussed in detail in Section V of Chapter 5. While the Schumann-Runge continuum is the most important source of 0( 3 P) and O^D) atoms in the high atmosphere, predissociation in the Schumann-Runge bands (Kockarts, 1976; Nicolet and Peetermans, 1980) makes a significant contribution at altitudes below 120 km. At even lower altitudes near 80 km, an important contribution comes from the weak Herzberg continuum with peak cross section less than 2 x 10" 2 8 m 2 , in the range 185-260 nm.
Threshold frequencies for formation of different ions are indicated. V. Penetration of Different Wavelengths into the Atmosphere Figure 4 shows the altitude in the atmosphere at which radiations of different wavelengths are reduced to e~l of their incident intensity. Indications are given of the main absorbing atoms or molecules in different wavelength regions. The data shown are derived from measured absorption coefficients and a typical model atmosphere. VI. , XY + + e ► X + Y. (17) Although the nature of this process is readily understood in a qualitative way and the order of magnitude of the rate coefficient can be estimated, the actual rate of any particular process, and especially its variation with electron and ion temperature, depends very much on the detailed shapes of potential energy curves for XY and XY + .
9). To obtain qle, it remains to determine the flux f(v, h) of photoelectrons. This is of major importance in another context, the calculation of the electron temperature as a function of altitude. Direct measurements of f(v, h) have been made from satellites such as the Atmosphere Explorers, and have been used mainly for comparison with theoretical calculations (see Fig. 2, Chapter 4). To calculate f(v, h\ it is first necessary to determine the initial velocity distribution f0(v) of photoelectrons resulting from the primary photoionization.
Applied Atomic Collision Physics. Atmospheric Physics and Chemistry by H.S.W. Massey (Eds.)