SOLAR-WIND ION-DRIVEN X-RAY EMISSION FROM COMETARY AND PLANETARY ATMOSPHERES: MEASUREMENTS AND THEORETICAL PREDICTIONS OF CHARGE-EXCHANGE CROSS-SECTIONS AND EMISSION SPECTRA FOR O{sup 6+} + H{sub 2}O, CO, CO{sub 2}, CH{sub 4}, N{sub 2}, NO, N{sub 2}O, AND Ar
- Atomic and Molecular Physics Laboratory, Research School of Physics and Engineering, The Australian National University, Canberra 2601 (Australia)
- Department of Physics, Utkal University, Bhubaneswar 751004 (India)
- Department of Physics, Univ. of North Texas, Denton, TX 76203 (United States)
- Atomic Spectroscopy Group, National Institute of Standards and Technology, Gaithersburg, MD 20899-8422 (United States)
- Astrophysics and Space Sciences Section, Jet Propulsion Laboratory/Caltech, Pasadena, CA 91109 (United States)
Relevant to modeling and understanding X-ray emission from cometary and planetary atmospheres, total cross-sections for 1.17 and 2.33 keV/u O{sup 6+} colliding with H{sub 2}O, CO, CO{sub 2}, CH{sub 4}, N{sub 2}, NO, N{sub 2}O, and Ar have been measured for the processes of single, double, and triple charge exchanges. Using these measurements as benchmarks, synthetic emission spectra spanning the X-ray, UV, and visible range have been calculated based on theoretical treatment of the transfer of between one and six electrons from the target neutrals to the projectile ion, followed by radiative and non-radiative decay of the highly excited states produced in these collisions. The results help add to the base of knowledge required to simulate ion-neutral processes in astrophysical environments; refine the present understanding of these fundamental atomic processes; and guide future observations, laboratory measurements, and theoretical predictions.
- OSTI ID:
- 22525613
- Journal Information:
- Astrophysical Journal, Vol. 809, Issue 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
ASTROPHYSICS
CARBON DIOXIDE
CARBON MONOXIDE
CHARGE EXCHANGE
COMETS
EMISSION SPECTRA
EXCITED STATES
ION-MOLECULE COLLISIONS
METHANE
NITRIC OXIDE
NITROUS OXIDE
OXYGEN IONS
PLANETARY ATMOSPHERES
RADIATIVE DECAY
SOLAR ELECTRONS
SOLAR WIND
TOTAL CROSS SECTIONS
WATER
X RADIATION