Photodissociation of N_{2}
This webpage is intended to be used in conjunction with the papers by Li et al. (2013, A&A, 555, A14) and Heays et al. (2014, A&A, 562, A61) containing detailed descriptions of how the shielding functions presented below were derived and how they should be used. If you publish anything based on these data, please be sure to cite these as follows:
Li, X., Heays, A.N., Visser, R., Ubachs, W., Lewis, B.R., Gibson, S.T., & van Dishoeck, E.F., Astronomy & Astrophysics, 555, A14 [Publisher, arXiv full text]
Heays, A. N., Visser, R., Gredel, R., Ubachs, W., Lewis, B. R., Gibson, S. T. & van Dishoeck, E. F. Astronomy & Astrophysics (2014), 562:A61 [Publisher, arXiv full text]
Cross sections
These cross sections assume an N_{2} excitation temperature of 100 K and a Doppler broadening of 1 km s^{-1}.- ^{14}N_{2} cross sections in binary/hdf5 format
- ^{14}N_{2} cross sections in text format
- ^{14}N^{15}N cross sections in binary/hdf5 format
- ^{14}N^{15}N cross sections in text format
Shielding functions
Shielding functions are available here for ^{14}N_{2} and ^{14}N^{15}N for several sets of parameters. Doppler widths are given as 2-sigma widths. There is a fixed elemental ratio in all cases, ^{14}N:^{15}N = 450:1 or ^{14}N_{2}:^{14}N^{15}N = 225:1).
[Download all shielding functions as an archive.]
- Individual Files in this archive contain shielding function for a particular excitation temperature (Tex), H_{2} linewidth (bH2), atomic-H linewidth (bH), and fixed atomic-H column-density (NH).
- Each file contains shielding functions over a grid of ^{14}N_{2} and H_{2} column densities. A separate grid is given for ^{14}N^{15}N shielding functions, in which case the dominant shielding is still due to ^{14}N_{2} and H_{2}. The range of ^{14}N_{2} and H_{2} column densities are listed before the grid arrays.