Slice imaging and velocity mapping using a single field

Journal Article · Tue Aug 15 04:00:00 EDT 2006 · Review of Scientific Instruments

DOI:https://doi.org/10.1063/1.2222084· OSTI ID:20853498

Papadakis, Vassilios; Kitsopoulos, Theofanis N ^[1]

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1. Institute of Electronic Structure and Laser, Foundation for Research and Technology-Hellas, Voutes, 71110 Heraklion (Greece)

In this study we demonstrate that it is possible to perform velocity mapping and slice imaging of charged particle products using a single field (two electrodes) improving on the multielectrode geometries of the past. The performance of this new geometry is competitive to the multielectrode ones, presently limited by detector 'spot' resolution. For imaging both photoelectrons and photofragments a resolution of {approx}1% in velocity is achieved without further software manipulation such as event counting. The advantages of this new design are its ability to focus large volumes, its achromaticity (very little sensitivity on photofragment velocities), independence of the laser beam position in the field perpendicular to the extraction field, and compactness. Using this new design we have studied the photodissociation dynamics of pyrrole at 243 nm and show that internal conversion of electronically excited state molecules to the ground state is important even at such low excitation energies.

• OSTI ID: 20853498
• Journal Information: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 8 Vol. 77; ISSN 0034-6748; ISSN RSINAK
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
BEAM POSITION
DESIGN
DISSOCIATION
EXCITATION
EXCITED STATES
GEOMETRY
GROUND STATES
IONS
MAPPING
MICROSCOPY
MOLECULES
PHOTOLYSIS
PYRROLES
RESOLUTION
SENSITIVITY
VELOCITY