Photoionization Mass Spectrometry with VUV Hydrogen Laser Source.
Abstract
Results are presented which characterize the VUV H2 laser as a selective ion source for analytical mass spectrometry of easily ionized compounds. The types of compounds ionized below the photon energy of 7.8 eV include many pharmaceuticals and drugs of abuse, such as cocaine, heroin, phencyclidine, methamphetamine, and LSD. H2 laser photoionization has produced parent ions only, for all compounds studied thus far. The selectivity of the threshold photoionization process is very high, as compounds within as little as 0.2 eV above the threshold are completely rejected. Photoactive species can be injected as solutions in appropriate organic solvents, without interference from the solvent. At low levels, ion signals are observed, which are due to acceleration of stray electrons in the ion source. The electrons result from interaction of scattered laser radiation with metal surfaces. Additional keywords: Chemical analysis; Optical properties; Naval research. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 21, 1985
- Accession Number
- ADA153362
Entities
People
- M. Bonner Denton
- T. C. Huth
Organizations
- University of Arizona