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Wavelength (nm)

FIGURE 4.4 Absorption coefficients of 02 in the 105- to 130-nm region. The 02 absorption line corresponding to the Lyman a line of the H atom is shown by the arrow. Note the log scale: Absorption coefficient k on right is for units of [atm at 273 K]-1 cm -1. (Adapted from Inn, 1955.)

J2paa

'2sag Jsaj

2pjiq il

FIGURE 4.5 (a) Molecular orbital diagram of ground X32, state of 02. (b) Comparison of highest occupied 2pn* MO for the ground state, X32t7, and the electronically excited a'A and b'X^ states.

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