Table I. Photoabsorption cross section of C and N components

The atomic photoabsorption cross section, Embedded Image, was obtained from the imaginary part of the atomic scattering factor Embedded Image using the relationEmbedded Image, where Embedded Image is the classical electron radius and Embedded Image 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 carbonEmbedded Image24,04021,440
Photoabsorption cross section of nitrogenEmbedded Image1,25629,457