Reaction.band_xsecs

band_xsecs (property)

Band-averaged cross sections for this reaction, one row per radiation band, as a tidy pandas.DataFrame. Assembled from the rad_groups back-references, which are populated when a radiation field is configured on the network (via the radiation_props argument to Network). Intended as the data source for band bar plots (see the bands option of plot_xsecs).

Returns

pandas.DataFrame: One row per band this reaction contributes to, with columns:

Column	Unit	Description
`lower`	eV	Lower band edge
`upper`	eV	Upper band edge (`inf` for an open top band)
`eavg`	eV	Photon-number-weighted band-average energy
`xsec`	cm²	Photon-number-weighted band-average cross section (`NaN` for custom-rate reactions)
`xsec_frac`	—	Fraction of the total cross section (or `dRad`) attributed to the band

The frame is empty (with the columns above) when the reaction contributes to no band, e.g. no radiation field is configured. Rows are ordered by ascending band index.

Example

from jaff.physics import RadiationProps

net = Network(
    "networks/h_photoionization/h_photo.jet",
    radiation_props=RadiationProps(bands=[1, 13.6, 100, "inf"]),
)
rxn = net.reactions.photo_reactions()[0]
rxn.band_xsecs          # DataFrame: lower / upper / eavg / xsec / xsec_frac
rxn.plot_xsecs(bands=True)        # overlay the band-averaged bars on σ(E)