A log of changes made to this website
- 2023-04-13
- The database has been updated with 14 new species and cross sections, photo-rates, and shielding coefficients have been updated for 16 species.
- 2020-11-03
- Some cross sections in .pd/.pi were altered in the 2020-09-16 update and are now reverted. The underlying cross sections are the same in all cases but the separation between continuum and line absorption has been restored.
- Fixed incorrect DOI reference for the CO2 cross section.
- 2020-09-16
- Updated CO2 cross section.
- Reprocessed some data to set slightly negative points in cross sections to zero, when these arise due to experimental noise.
- Reprocessed full spectral resolution cross sections to 0.1nm wavelength scale. The new processing rigorously preserves the same long-wavelength thresholds (within 0.1nm). Slightly differences occur throughout the spectrum because a different binning and/or interpolation algorithm was used. The trapezoidal integration of cross sections is preserved in all cases.
- 2020-03-11
- Fixed erroneous cross section for O2.
- Renamed hdf5 files to h5.
- 2017-11-01
- Some cross sections are excessively detailed for many applications and so resampled versions (as .pd/.pi files or .txt) files have been added. This includes .pd files for N2 and H2 that list each vibrational band as a single line.
- A new compilation of HF photodissociation and photoionisation cross sections have been added.
- A high resolution 14N15N photodissociation cross section has been added to here.
- 2017-04-01
- In some cases due to experimental noise there are small
negative values for cross sections. These have been adjusted
to zero to avoid any possible numerical problems.
- The S photoionisation cross section included a small
value at longer wavelength than its threshold, due to a finite
experimental resolution. This has been set to zero. This
reduces its small photodissociation rate by Ly-alpha radiation
to zero.
- Added a third cross section file format. These contain
that same data as the binary hdf5 files but in a text file for
easy usage. Lines and continuum are included in a single cross
section. File sizes and load times are likely larger and
longer for this data relative to the hdf5 formatted data.
- 2017-01-01
- Updated database in view of new data in Heays et al. 2017.
