Astronomy and Astrophysics – Astronomy
Scientific paper
May 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aps..dmp..lp25g&link_type=abstract
American Physical Society, DAMOP Meeting, 27-30 May 1998 Santa Fe, New Mexico, abstract #LP.25
Astronomy and Astrophysics
Astronomy
Scientific paper
Spectral emissions from SIII have been observed in a number of astronomical plasmas, with both forbidden and allowed transitions particularly intense in the Io torus. Electron-ion collisions are often the dominant excitation mechanism and absolute cross sections for this process are necessary to characterize the plasma. Our experiment measures total absolute cross sections by employing a merged beams technique to excite the ions. A detailed description has been given previously (S. J. Smith et al., Phys. Rev. A 48 292 (1993)) but we will be presenting a number of significant improvements. An electron cyclotron resonance ion source has recently been installed to study multiply charged ions observed in high temperature plasmas and a novel electronic aperture has been used at the end of the merged region to filter out unwanted elastically-scattered electrons. Recent theoretical results (S. S. Tayal, Ap. J. 481, 550 (1997)) have predicted many resonances for lower lying transitions in SIII, which provide a dominant contribution to the cross section. We will be presenting our results in comparison to this theoretical work. JBG acknowledges support through the NASA-NRC program. This work was carried out at JPL/Caltech and was supported by NASA.
Chutjian Ara
Greenwood Jason B.
Smith Stephen J.
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