C 1 s ionization in C sub 2 H sub 2 studied by asymmetric ( e ,2 e ) experiments

Journal Article · Mon Jan 01 04:00:00 EST 1990 · Physical Review, A (General Physics); (USA)

DOI:https://doi.org/10.1103/PhysRevA.41.134· OSTI ID:6982008

Avaldi, L; Camilloni, R ^[1]; Stefani, G ^[2]

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1. Istituto di Metodologie Avanzate Inorganiche del Consiglio Nazionale delle Ricerche, Area della Ricerca di Roma, Casella Postale 10, 00016 Monterotondo, (Italy)
2. Dipartimento di Matematica e Fisica, Universita di Camerino, 62032 Camerino, (Italy)

The dynamics of core ionization by electron impact is investigated through the measurement of the triply differential cross section of the C {sigma}1{ital s} orbital in the molecule C{sub 2}H{sub 2}. The ({ital e},2{ital e}) experiments have been performed under asymmetric conditions and at small scattering angles, with a scattered electron energy of 1500 eV and low energies of the ejected electrons (9.6 and 41.0 eV). The measured angular distributions are characterized by large-size recoil lobes, breaking of the symmetry around the momentum-transfer direction, and unusual deviations of the maxima of the recoil peaks towards smaller deflection angles. In the ({ital e},2{ital e}) energy spectrum a shift is observed in the position of the C {sigma}1{ital s} peak with respect to the expected value as measured by x-ray photoelectron spectroscopy. The amplitude of the shift amounts to 0.46{plus minus}0.23 eV at 9.6 eV excess energy, and it is too large to be explained only in terms of postcollision interactions.

• OSTI ID: 6982008
• Journal Information: Physical Review, A (General Physics); (USA), Journal Name: Physical Review, A (General Physics); (USA) Vol. 41:1; ISSN PLRAA; ISSN 0556-2791
• Country of Publication: United States
• Language: English

Related Subjects

640304* -- Atomic
Molecular & Chemical Physics-- Collision Phenomena
74 ATOMIC AND MOLECULAR PHYSICS
ACETYLENE
ALKYNES
ANGULAR DISTRIBUTION
ASYMMETRY
BEAM DYNAMICS
BEAM-BEAM INTERACTIONS
COINCIDENCE METHODS
COLLISIONS
COUNTING TECHNIQUES
CROSS SECTIONS
DIFFERENTIAL CROSS SECTIONS
DISTRIBUTION
ELECTRON COLLISIONS
ELECTRON-MOLECULE COLLISIONS
ENERGY RANGE
ENERGY SPECTRA
ENERGY TRANSFER
HYDROCARBONS
INNER-SHELL IONIZATION
IONIZATION
KEV RANGE
MOLECULE COLLISIONS
ORGANIC COMPOUNDS
SPECTRA