Energy and angular distributions of electron DDCS for 3.5 MeV/u C$^{6+}$+O$_{2}$: Interferences

S. NANDI; A. N. AGNIHOTRI; S. KASTHURIRANGAN; A. KUMAR; C. A. TACHINO; R. D. RIVAROLA; F. MARTÍN; L. C. TRIBEDI

Caen

Simposio; XXII International Symposium on Ion-Atom Collisions; 2011

The study of interaction of multiply charged heavy ions with diatomic molecules provides important information regarding Coulomb ionization process. It can be implicitly used to detect the Young type interference effect in the electron emission from a diatomic molecule itself, by looking into the oscillatory behaviour in the electron double differential cross section (DDCS) spectrum [1,2]. We have measured the absolute electron DDCS of O$_{2}$ between 1 to 600 eV, in collision with 42 MeV bare carbon ions in an angular range of 30º to 150º. The projectile ions were produced in the Pelletron accelerator at TIFR. The preliminary data on the DDCS ratio of (O$_{2}$/2 O), obtained by using theoretical DDCS for atomic oxygen, does not show prominent oscillatory behaviour, unlike in the case of H$_{2}$ [1,2]. In addition, the asymmetry parameter ($\alpha$) can be defined as the ratio of the difference and sum of DDCS for supplementary forward and backward angles [2,3]. No oscillation was observed in $\alpha$, which is in contrast to the oscillatory structure observed earlier for H$_{2}$ [2,3]. However, the KLL-Auger electron SDCS shows an oscillatory structure as a function of angle.[1] Stolterfoht et al., Phys. Rev. Lett. 87, 023201 (2001).[2] Misra et al., Phys. Rev. Lett. 92, 153201 (2004).[3] Misra et al., Phys. Rev. A 74, 060701(R) (2006).