The emission and ion formation mechanisms leading to the observation of Arn+(n≤6) and Xe2+ from sputtered surfaces and show that these species arise from expansion cooling of gas from ruptured bubbles producing neutral clusters, followed by gas-phase ionization by resonant charge exchange. Laurent et al. first observed Arn+ in a secondary ion mass spectrometry (SIMS) study of Ar+-sputtered heated A1 and noted that cluster ion formation must be due to rupture of bubbles during material removal by sputtering.
|Physical Review Letters
|Published - Jul 4 2003
ASJC Scopus subject areas
- General Physics and Astronomy