Abstract
The first gated laser induced fluorescence (LIF)-imaging and absorption spectroscopy have been performed on laser desorbed plumes from organic crystals which are commonly used as MALDI (matrix assisted laser desorption ionization) matrices. These plasma diagnostic techniques, and also ion probe measurements, were employed to investigate the desorbed products, densities, fractional ionization and velocity distributions of the plume of 3-hydroxypicolinic acid (3-HPA) under ArF(193 nm)- and KrF(248 nm)-laser irradiation. In both cases, gated LIF imaging using 308 nm excitation revealed two plume components: a fast (maximum ~0.1 cm/μs) low-intensity component which appear to be 3-HPA fragments, and a slower component of 3-HPA expanding at 0.05 cm/μs.
| Original language | English |
|---|---|
| Pages (from-to) | 425-432 |
| Number of pages | 8 |
| Journal | Chemical Physics Letters |
| Volume | 286 |
| Issue number | 5-6 |
| DOIs | |
| State | Published - Apr 17 1998 |
Funding
The authors gratefully acknowledge assistance in sample preparation and many helpful discussions with G. Hurst and M. Buchanan and the assistance of B.C. Sales and L.A. Boatner with optical and scanning electron microscopy. This research was sponsored by the Laboratory Directed Research Development Program at Oak Ridge National Laboratory, managed by Lockheed Martin Energy Research Corp., for the US Department of Energy, under contract DE-AC05-96OR22464. AAP was supported by an appointment to the ORNL Postdoctoral Research Associates Program administered jointly by ORNL and the Oak Ridge Institute for Science and Education.