Table I. Photoabsorption cross section of C and N components

The atomic photoabsorption cross section, , was obtained from the imaginary part of the atomic scattering factor using the relation, where is the classical electron radius and is the wavelength. The calculated photoabsorption cross sections were compared with experimental data (Henke et al., 1993). The database of photoabsorption cross sections (https://www.cxro.lbl.gov/) also is available.

ParameterUnithν = 398 eVhν = 416 eV
cm2 g−1
Photoabsorption cross section of carbon24,04021,440
Photoabsorption cross section of nitrogen1,25629,457