Electron-impact ionization of the SO free radical

Journal Article · Sun Jan 08 04:00:00 EST 1995 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.469190· OSTI ID:167048

Tarnovsky, V; Levin, A ^[1]; Deutsch, H ^[2]; Becker, K ^[1]

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1. Department of Physics, City College of C.U.N.Y., New York, New York 10031 (United States)
2. Fachbereich Physik, Ernst-Moritz-Arndt Universitaet Greifswald (Germany)

We studied the electron-impact ionization of the SO free radical using the fast-neutral-beam technique. Absolute cross sections were measured for the formation of the SO{sup +} parent ion as well as for the S{sup +} and O{sup +} fragment ions from threshold to 200 eV. At 70 eV, cross section values of 3.25{plus_minus}0.50{times}10{sup {minus}20} m{sup 2} (SO{sup +}), 1.32{plus_minus}0.23{times}10{sup {minus}20} m{sup 2} (S{sup +}), and 0.45{plus_minus}0.08{times}10{sup {minus}20} m{sup 2} (O{sup +}) were obtained. We found little evidence of the presence of vibrationally excited SO radicals in the incident target beams and only negligible contributions to the measured ion signal from excited SO radicals in Rydberg and/or metastable states were observed. The only significant pathway contributing to the formation of the observed SO{sup +}, S{sup +}, and O{sup +} ions is the single positive ion formation. The measured partial ionization cross sections were combined to yield the absolute total single ionization cross section of SO which was compared to calculations using a recently introduced modified additivity rule. The agreement between measured and calculated cross sections was found to be very good. {copyright} {ital 1995} {ital American} {ital Institute} {ital of} {ital Physics}.

• OSTI ID: 167048
• Journal Information: Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 2 Vol. 102; ISSN JCPSA6; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
CROSS SECTIONS
ELECTRON-MOLECULE COLLISIONS
IONIZATION
METASTABLE STATES
MOLECULAR BEAMS
MOLECULAR IONS
PLASMA
RADICALS
RYDBERG STATES
SULFUR DIOXIDE
SULFUR OXIDES
THRESHOLD ENERGY
YIELDS