Collision dynamics for small helium cluster ions

✍ Scribed by S. Danko Bosanac; John N. Murrell

• Book ID: 103034867
• Publisher: Elsevier Science
• Year: 1996
• Tongue: English
• Weight: 290 KB
• Volume: 254
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(96)00229-1

✦ Synopsis

Classical trajectories have been carried out for the collision of helium atoms with He~ and He~ using a potential energy which includes the effects of dispersion, polarisation and charge exchange. At a collision energy of 0.1 eV the cross-section for atom exchange in He + He~-is calculated to be 21.5 ,~2, exchange occurring through both simple collisions and long-lived complexes. However, even for very long-lived complexes exchange never exceeds 50% so that complete permutation of atoms in the complex does not occur. The cross-section for exchange in He + He~-at the same collision energy is found to be much smaller at 0.7 .~2 which is attributed to the much smaller dissociation energy of He~-. Rotational energy transfer for both collisions is similar, for impact parameters less than 3.5 ,~ only 50% of collisions transfer more than 10% of translational energy to rotation.