HR: 11:05h
AN: P42A-03 INVITED     [Abstracts]
TI: Laboratory Charge Exchange Cross Sections and X-Ray Astrophysics
AU: * Chutjian, A
EM: ara.chutjian@jpl.nasa.gov
AF: Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109 United States
AU: Smith, S J
EM: steven.j.smith@jpl.nasa.gov
AF: Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109 United States
AU: Djuric, N
EM: nada.djuric@jpl.nasa.gov
AF: Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, CA 91109 United States
AB: The exciting and unexpected observation that hot X-rays could be produced from cold comets has spurred considerable work in the area of collisions of highly-charged ions (to simulate the solar wind) with gases such as H₂, CO, H₂O, CO₂, and CH₄ (to simulate the comet-evolved gases). The spectral energies and intensities suggest that the X-rays arise from solar wind highly-charged ions (HCIs) that have charge-exchanged with the neutral species, leaving excited HCIs that stabilize via X-ray emission [1,2]. We will review recent work in the area of X-ray emissions and charge exchange, and present recent results of absolute charge-exchange cross sections and X-ray spectra. The work carried out at JPL/Caltech was supported through agreement with NASA. [1] V. Kharchenko et al., Ap. J. 585, L73 (2003). [2] J. B. Greenwood et al., Phys. Scripta T110, 358 (2004).
DE: 6060 Radiation and spectra
DE: 7823 Ionization processes
DE: 7831 Laboratory studies
SC: Planetary Sciences [P]
MN: 2005 Joint Assembly