Impact-parameter dependence of the electronic energy loss of fast cluster projectiles

✍ Scribed by R.C. Fadanelli; P.L. Grande; G. Schiwietz

• Publisher: Elsevier Science
• Year: 2005
• Tongue: English
• Weight: 170 KB
• Volume: 230
• Category: Article
• ISSN: 0168-583X
• DOI: 10.1016/j.nimb.2004.12.010

✦ Synopsis

Electronic energy loss of molecular clusters as a function of impact-parameter is less understood than atomic energy loss. Vicinage effects due to mutual interference between cluster fragments play a key role in the determination of the cluster electronic energy loss. In this work, we describe a molecular extension of the perturbative convolution approximation (PCA) energy loss model, namely MPCA (molecular PCA), which yields remarkable agreement with first-order Born semiclassical approximation (SCA) results. The physical inputs of the model are the oscillators strengths of the target atoms and the projectile electron density. A very good agreement is obtained with time consuming full first-order calculations for bare incident molecular clusters for several angles between cluster axis and velocity direction.