Dissociation Dynamics and Particle Impacts: Electrostatic Ion Beam Traps and Charge Detection Mass Spectrometry
Molecular Physics seminar
Monday 10 April 2017
to 11:00 at
Robert E. Continetti (Department of Chemistry and Biochemistry, University of California)
The study of the energetics and dynamics of transient species using negative ion precursors in conjunction with photoelectron-photofragment coincidence spectroscopy has been benefitted from the introduction of electrostatic ion beam traps and cryogenic RF accumulator traps in recent years. Recent progress in the examination of transient species, including characterization of the C2O2- molecular anion and the examination of the OH + CH4 → H2O + CH3 potential energy surface by photodetachment of OH-(CH4) will be reviewed. The status of an instrument development project involving a single-particle dust accelerator/decelerator, the Aerosol Impact Spectrometer, will also be reviewed. This apparatus makes use of electrospray ionization to produce charged nanoparticles, with the mass and charge of single nanoparticles measured using charge detection mass spectrometry techniques prior to acceleration or deceleration to desired final velocities for surface impact studies. Applications to measurements of the coefficient of restitution for polystyrene latex spheres and tin nanoparticles, as well as measurements of the durability of free-standing nanostructure with respect to particle impact, will be presented.