Papers in brief
From Tauwiki
1) The Distribution of Thermal Pressures in the Diffuse, Cold Neutral Medium of Our Galaxy. II. An Expanded Survey of Interstellar C I Fine-structure Excitations
Authors: Edward B. Jenkins and Todd M. Tripp
Bibliographic code: 2011ApJ...734...65J
1) Interstellar O I can be used as a proxy to estimate interstellar C II column densities. This method applies only to neutral gas.
2) The ratio of C II to C I allows one to estimate the local radiation density.
