Table · dataset · 2021
The C^+^ ion photofragment spectra
Listed in IVOA Registry (Virtual Observatory)
Carbon monoxide (CO) is one of the most abundant molecular species in comets.
Description
Its photodissociation by the solar radiation in the vacuum ultraviolet (VUV) region produces excited atomic fragments C(^1^D), C(^1^S), and O(^1^D), which radiate at characteristic wavelengths when they decay to lower states. The fractional rate constants for generating these fragments from CO photodissociation under the entire range of the solar radiation field are key input values in modelling the observed atomic emission intensities from comets.
In this study, the branching ratios of the four lowest dissociation channels C(^3^P)+O(^3^P), C(^1^D)+O(^3^P), C(^3^P)+O(^1^D), and C(^1^S)+O(^3^P) of the ^12^C^16^O photodissociation are measured in the VUV energy range between the threshold of producing the C(^1^S)+O(^3^P) channel (~110500cm^-1^) and the ionisation energy (IE) of ^12^C^16^O (~113045cm^-1^). We measured these ratios using the VUV time-slice velocity-map ion imaging apparatus.
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We observe a number of high Rydberg states in the aforementioned energy range, with most of them mainly producing ground C(^3^P) and O(^3^P) atomic fragments, and only a few of them producing a significant amount of excited C(^1^D) or O(^1^D) fragments. We also observe the excited C(^1^S) fragment from CO photodissociation and measured its branching ratio for the first time. Based on the photodissociation branching ratios measured in the current and previous studies, we are able to estimate the relative percentages of the excited atomic fragments C(^1^D), C(^1^S), and O(^1^D) from the solar photolysis of ^12^C^16^O below its IE.
We discuss the implications for the photochemical modelling of the CO-dominated comet C/2016 R2 (Pan-STARRS).
Links
Where it is published
- Reference page cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/647/A127 ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 2021A&A...647A.127G ui.adsabs.harvard.edu/abs/2021A%26A...647A.127G ↗
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/a%2Ba/647/a127 ↗
catalogue entry · from IVOA Registry
Topics
- Stated by source
- Uv
- From keywords
- Astronomy & Astrophysics
- Inferred from text
- Imaging 75% · Space sciences 68%
Provenance · 1 source records, 10 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| IVOA Registry (Virtual Observatory) | ivo://cds.vizier/j/a+a/647/a127 | 15 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 (68%) |
| concepts[field].local:field:astronomy | mapping · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| concepts[modality].ivoa_waveband:uv | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| concepts[modality].local:modality:imaging | enrichment · IVOA Registry | keyword-concept-rules@1.0.0 | title+description (75%) |
| 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 |