Electron-impact excitation of multiply-charged ions using energy loss in merged beams: e + Si sup 3 + (3s sup 2 S sub 1/2 ) yields e + Si sup 3 + (3p sup 2 P sub 1/2, 3/2 )

Conference · Mon Jan 01 00:00:00 EST 1990

OSTI ID:6234172

Wahlin, E K; Thompson, J S; Dunn, G H ^[1]; Phaneuf, R A; Gregory, D C ^[2]; Smith, A C.H. ^[3]

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1. National Inst. of Standards and Technology, Boulder, CO (USA) Joint Inst. for Lab. Astrophysics, Boulder, CO (USA)
2. Oak Ridge National Lab., TN (USA)
3. Oak Ridge National Lab., TN (USA) University Coll., London (UK)

For the first time absolute total cross sections for electron-impact excitation of a multiply-charged ion have been measured using an electron-energy-loss technique. Measurements were made near threshold for the process e + Si{sup 3+}(3s{sup 2}S{sub 1/2}) {yields} e + Si{sup 3+}(3p{sup 2}P{sub 1/2},{sub 3/2}) -- 8.88 eV. The 10{sup {minus}15} cm{sup 2} measured cross section agrees with results of 7-state close coupling calculations to better than the {plus minus}20% (90% CL) total uncertainty of the measurements. Convoluting the theoretical curve with a Gaussian energy distribution indicates an energy width of 0.15 {approx lt} {Delta}E {approx lt} 0.20 eV. 12 refs., 2 figs.

• Research Organization: Oak Ridge National Lab., TN (USA); National Inst. of Standards and Technology, Boulder, CO (USA); Joint Inst. for Lab. Astrophysics, Boulder, CO (USA); University Coll., London (UK)
• Sponsoring Organization: DOE/ER
• DOE Contract Number: AC05-84OR21400; AI01-76PR06010
• OSTI ID: 6234172
• Report Number(s): CONF-900923-5; ON: DE91002884; TRN: 91-000027
• Resource Relation: Conference: 5. international conference on the physics of highly charged ions, Giessen (Germany, F.R.), 10-14 Sep 1990
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
SILICON IONS
ELECTRON-ION COLLISIONS
ENERGY LOSSES
EXCITATION
MULTICHARGED IONS
TOTAL CROSS SECTIONS
CHARGED PARTICLES
COLLISIONS
CROSS SECTIONS
ELECTRON COLLISIONS
ENERGY-LEVEL TRANSITIONS
ION COLLISIONS
IONS
LOSSES
640304* - Atomic
Molecular & Chemical Physics- Collision Phenomena