Accession Number:

AD0729185

Title:

Differential and Integral Cross Sections for the Electron Impact Excitation of the 2 singlet Delta(g) and b singlet Sigma(g)(+) States of O2.

Descriptive Note:

Rept. for Aug 70-Mar 71,

Corporate Author:

AEROSPACE CORP EL SEGUNDO CALIF LAB OPERATIONS

Personal Author(s):

• Cartwright,David C.
• Trajmar,Sandor
• Williams,Walter

Report Date:

1971-08-01

Pagination or Media Count:

45.0

Abstract:

Electron impact energy-loss spectra of O2 have been analyzed for incident electron energies from 4 eV to 45 eV, scattering angles from 10 to 90 degrees, and for energy loss from 0 to 5 eV. The inelastic processes observed were the excitation of the a singlet Deltag and b singlet Sigmag electronic states and vibrational excitation in some cases to v 13. The excitation cross sections at each energy were made absolute by normalizing the sum of the integral cross sections all inelastic, ionization and elastic to measured electron-O2 total cross sections. The differential cross sections for the a singlet Deltag and b singlet Sigmag states show nearly isotropic behavior as expected for optically spin-forbidden transitions. The elastic differential cross sections are strongly forward peaked at higher energies but become only slightly forward peaked at the lower energies. Author

Descriptors:

• *ELECTRON TRANSITIONS
• OXYGEN
• ELECTRON IRRADIATION
• MOLECULAR ENERGY LEVELS
• POTENTIAL SCATTERING

Subject Categories:

• Atomic and Molecular Physics and Spectroscopy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE