Systematics and scaling of differential ionization cross sections in multicharged ion-atom collisions

Journal Article · Fri Dec 31 23:00:00 EST 1993 · Physical Review A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.49.350· OSTI ID:5338100

DuBois, R D; Toburen, L H; Middendorf, M E ^[1]; Jagutzki, O ^[2]

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1. Pacific Northwest Laboratory, Richland, Washington 99352 (United States)
2. Institute fuer Kernphysik der Johann-Wolfgang-Goethe-Universitaet Frankfurt, D-6000 Frankfurt am Main (Germany)

Absolute doubly differential cross sections for electron emission are presented for 0.5-MeV/u multicharged ion-atom collisions. The collision systems investigated are B[sup [ital q]+], C[sup [ital q]+] ([ital q]=2--5) and O[sup [ital q]+], F[sup [ital q]+] ([ital q]=3--6) projectiles impacting on helium and C[sup [ital q]+] ([ital q]=2--5) ions impacting on neon and argon targets. Laboratory electron emission angles between 10[degree] and 60[degree] were studied. Under the assumption that the cross sections scale with the square of an effective projectile charge, [ital Z][sub [ital e][ital f][ital f]]([var epsilon],[theta]), the scaling was investigated as a function of emitted electron velocity and angle. For distant collisions (low-energy electron emission), we find that [ital Z][sub [ital e][ital f][ital f]]([var epsilon],[theta])[gt][ital q] for small [ital q]. For the highest values of [ital q] investigated, [ital Z][sub [ital e][ital f][ital f]]([var epsilon],[theta]) was found to be smaller than the net projectile charge [ital q]. The effective projectile charges may be subject to a systematic underestimation since they were determined by referencing the partially stripped ion impact data to fully stripped boron, rather than proton, impact cross sections. In the binary-encounter region, the present data confirm previously observed features--namely that the emission increases as [ital q] decreases. For the helium target, the qualitative behavior is roughly in accordance with predictions by Schulz and Olson [J. Phys. B 24, 3409 (1991)]. Neon and argon targets also demonstrate these features, but less dramatically than helium.

• DOE Contract Number: AC06-76RL01830
• OSTI ID: 5338100
• Journal Information: Physical Review A; (United States), Journal Name: Physical Review A; (United States) Vol. 49:1; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

664300* -- Atomic & Molecular Physics-- Collision Phenomena-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
ARGON
ATOM COLLISIONS
BORON IONS
CARBON IONS
CHARGED PARTICLES
COLLISIONS
CROSS SECTIONS
DIFFERENTIAL CROSS SECTIONS
ELECTRON EMISSION
ELEMENTS
EMISSION
ENERGY RANGE
FLUIDS
FLUORINE IONS
GASES
HELIUM
ION COLLISIONS
ION-ATOM COLLISIONS
IONS
KEV RANGE
KEV RANGE 100-1000
MULTICHARGED IONS
NEON
NONMETALS
OXYGEN IONS
RARE GASES
SCALING