Absolute total destruction cross sections of B and Al small anionic clusters impinging onN2targets

Abstract

Absolute total destruction cross sections of B n Ϫ (nϭ1,2) and Al n Ϫ (nϭ1 -4) clusters colliding with N 2were measured for relative velocities in the interval 0.2-1.0 a.u. All cross-section curves may be described as a single curve, presenting a maximum around the velocity of 0.3 a.u., multiplied by a projectile-dependent factor. For the Al n Ϫ case, this factor increases linearly with the projectile size n. These findings agree with previous works for anionic atoms and clusters being destroyed in noble gases, where the single curve contains the data target dependence and the scaling factors are also linear in n.

Electron-loss cross sections for heavy-ion beam probe using gold beams: experiment and theory

“…Similar measurements have been performed in our laboratory over the last few years (Luna et al 2001a, 2001b, Zappa et al 2001, 2003a, 2003b, Barros et al 2005, Sant'Anna et al 2004, 2006a, 2006b, with a variety of anionic projectiles and gas targets, showing an amazing regularity and clear correlation with the dynamics of the total scattering of free electrons. This similarity pointed to the presence of an underlying dominant physical process in the intermediate-to-high velocity region.…”

Electron-detachment cross section forCN−andO2−incident on N2at intermediate velocities

“…1, together with the free-electron scattering cross section- elastic plus inelastic-with N 2 [σ electron (V )] [15]. We have included the already measured data B − 2 and Al − 2 [16] in order to emphasize the huge resonance effect in the anions' cross sections. The error bars of the present measurements, CN − and O − 2 , came from the exponential adjustment parameter and their systematic error component of calibration (≈10%) is not included in order to draw attention to the small random error; see Fig.…”

“…From bottom to top one first finds our present results of CN − ; the second set belongs to O − 2 and it consists of two parts: the one on the left refers to the data of Ref [17]. and the other on the right to our results; the third and fourth correspond to Al − 2 and B − 2[16], respectively.…”

Total detachment cross sections of C−, CH−, C2−, and CNascimento1, Mello2, Magnani3 et al. 2013Phys. Rev. ASelf Cite8010View full textAdd to dashboardCite

“…Details about the method and our experimental setup were given in previous publications [31][32][33][34][35][36][37], and only the main features are described here. The method is based on the use of the high-voltage terminal as the collision chamber, with the collision target being what is traditionally used only as a gas stripper to produce positive ions and neutral species at the second stage of the accelerator.…”