Skip to main content
eScholarship
Open Access Publications from the University of California

Direct IR excitation in a fast ion beam: application to NO- photodetachment cross sections

  • Author(s): Otto, Rico
  • Ray, Amelia W
  • Daluz, Jennifer S
  • Continetti, Robert E
  • et al.

Published Web Location

www.epjtechniquesandinstrumentation.com/content/1/1/3
No data is associated with this publication.
Abstract

Background: Optical access to a travelling ion packet is required in many ion beamexperiments that study ion-photon interactions.Methods: An approach is described for carrying out direct infrared excitation of a fastion beam that uses an optical-quality reflective beam blocker to illuminate a counterpropagating pulsed ion beam in a collinear configuration. This arrangement providesoptical access along the axis of ion beam propagation by placing a mirror in the beampath at a 25 degree angle. The ion packet is bumped over the mirror, which is alsoused to block fast neutral particles produced during ion beam acceleration that alsopropagate along the beam path.Results: The efficiency of this setup is demonstrated in a photodetachment experimenton NO− anions, where a photoinduced depletion of up to 90% of the beam is achievedin a single laser shot. To demonstrate the application of this configuration, the relativephotodetachment cross section for NO− has been measured in the range of 2800 –7200 cm-1. The measured relative cross section shows a set of sharp peaks that areidentified as vibrational autodetachment resonances.Conclusion: The new setup paves the way for future experiments where parentanionic species are vibrationally excited via direct infrared excitation first andundergo photodetachment/photodissociation in a subsequent step.

Many UC-authored scholarly publications are freely available on this site because of the UC Academic Senate's Open Access Policy. Let us know how this access is important for you.

Item not freely available? Link broken?
Report a problem accessing this item