Table · dataset · 2016
H_2_ d^3^{Pi}_u_ excitation by electron impact
Listed in IVOA Registry (Virtual Observatory)
Electron-impact excitation of H_2_ triplet states plays an important role in the heating of outer planet upper thermospheres.
Description
The d^3^{Pi}_u_ state is the third ungerade triplet state, and the d^3^{Pi}_u_-a^3^{Sigma}_g_^+^ emission is the largest cascade channel for the a^3^{Sigma}_g_^+^ state. Accurate energies of the d^3^{Pi}_u_^-^(v, J) levels are calculated from an ab initio potential energy curve.
Radiative lifetimes of the d^3^{Pi}_u_(v,J) levels are obtained by an accurate evaluation of the d^3^{Pi}_u_-a^3^{Sigma}_g_^+^ transition probabilities. The emission yields are determined from experimental lifetimes and calculated radiative lifetimes and are further verified by comparing experimental and synthetic d^3^{Pi}_u_-a^3^{Sigma}_g_^+^ spectra at 20eV impact energy. Spectral analysis revealed that multipolar components beyond the dipolar term are required to model the X^1^{Sigma}_g_^+^-d^3^{Pi}_u_ excitation, and significant cascade excitation occurs at the d^3^{Pi}_u_ (v=0,1) levels.
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Kinetic energy (E_k_) distributions of H atoms produced via predissociation of the ^3^{Pi}_u_ state and the d^3^{Pi}_u_-a^3^{Sigma}_g_^+^-b^3^{Sigma}_u_^+^ cascade dissociative emission are obtained. Predissociation of the d^3^{Pi}_u_ state produces H atoms with an average E_k_ of 2.3+/-0.4 eV/atom, while the E_k_distribution of the d^3^{Pi}_u_-a^3^{Sigma}_g_^+^-b^3^{Sigma}_u_^+^ channel is similar to that of the X^1^{Sigma}_g_^+^-a^3^{Sigma}_g_^+^-b^3^{Sigma}_u_^+^ channel and produces H(1s) atoms with an average E_k_ of 1.15+/-0.05eV/atom.
On average, each H_2_ excited to the d^3^{Pi}_u_ state in an H_2_-dominated atmosphere deposits 3.3+/-0.4eV into the atmosphere, while each H_2_directly excited to the a^3^{Sigma}_g_^+^ state gives 2.2-2.3eV to the atmosphere. The spectral distribution of the calculated a^3^{Sigma}_g_^+^-b^3^{Sigma}_u_^+^ continuum emission due to the X^1^{Sigma}_g_^+^-d^3^{Pi}_u_ excitation is significantly different from that of direct a^3^{Sigma}_g_^+^ excitation.
Links
Where it is published
- Reference page cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/818/120 ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 2016ApJ...818..120L ui.adsabs.harvard.edu/abs/2016ApJ...818..120L ↗
publication · from IVOA Registry
Catalogue records · 2
- VOResource record dc.g-vo.org/oai.xml?verb=GetRecord&metadataPrefix=ivo_vor&identifier=ivo%3… ↗
metadata API · from IVOA Registry
- Registry record (GAVO) dc.g-vo.org/I/cds.vizier/j/apj/818/120 ↗
catalogue entry · from IVOA Registry
Topics
- From keywords
- Astronomy & Astrophysics
- Inferred from text
- Space sciences 73%
Provenance · 1 source records, 8 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| IVOA Registry (Virtual Observatory) | ivo://cds.vizier/j/apj/818/120 | 12 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| access_level | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| concepts[field].anzsrc:group:5109 | enrichment · IVOA Registry | taxonomy-embedding@1.1.0 | title+keywords+description (73%) |
| concepts[field].local:field:astronomy | mapping · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| description | source · IVOA Registry | connector:ivoa_registry@1.0.0 | rr.resource.res_description |
| license_text | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| publication_date | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| title | source · IVOA Registry | connector:ivoa_registry@1.0.0 | rr.resource.res_title |
| updated_date | source · IVOA Registry | connector:ivoa_registry@1.0.0 |