Pulsed laser desorption with resonant two-photon ionization detection in supersonic beam mass spectrometry
Journal Article
·
· Anal. Chem.; (United States)
Laser desorption is used as a means of volatilizing high-melting-point or thermally labile compounds into a supersonic jet expansion. The neutral desorbed species are carried into the acceleration region of a time-of-flight mass spectrometer (TOFMS) where they are ionized by resonant two-photon ionization with an ultraviolet laser. In this soft ionization process only the molecular ion is detected in the TOFMS for several large polynuclear aromatic hydrocarbons and nonvolatiles such as adenine and cytosine. The desorption process in this work uses a shock mechanism in thick samples in which approximately a monolayer is desorbed per laser pulse so that extended repetitive desorption can be obtained for each sample. The effect of different wavelengths for producing neutral molecules without extensive ionization-fragmentation processes occurring is also investigated. In addition, the translational cooling of desorbed neutrals in the supersonic expansion is investigated based upon the ion packed width detected in the TOFMS.
- Research Organization:
- Univ. of Michigan, Ann Arbor
- OSTI ID:
- 5630633
- Journal Information:
- Anal. Chem.; (United States), Journal Name: Anal. Chem.; (United States) Vol. 58:7; ISSN ANCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400104* -- Spectral Procedures-- (-1987)
AIR TRANSPORT
AROMATICS
CHEMICAL ANALYSIS
DATA
DESORPTION
ELECTROMAGNETIC RADIATION
EXPERIMENTAL DATA
HYDROCARBONS
INFORMATION
IONIZATION
LASERS
MASS SPECTROSCOPY
MULTI-PHOTON PROCESSES
NUMERICAL DATA
ORGANIC COMPOUNDS
PHOTOIONIZATION
POLYCYCLIC AROMATIC HYDROCARBONS
PULSE TECHNIQUES
QUANTITATIVE CHEMICAL ANALYSIS
RADIATIONS
SPECTROSCOPY
SUPERSONIC TRANSPORT
TIME-OF-FLIGHT METHOD
TRANSPORT
ULTRAVIOLET RADIATION
WAVELENGTHS
400104* -- Spectral Procedures-- (-1987)
AIR TRANSPORT
AROMATICS
CHEMICAL ANALYSIS
DATA
DESORPTION
ELECTROMAGNETIC RADIATION
EXPERIMENTAL DATA
HYDROCARBONS
INFORMATION
IONIZATION
LASERS
MASS SPECTROSCOPY
MULTI-PHOTON PROCESSES
NUMERICAL DATA
ORGANIC COMPOUNDS
PHOTOIONIZATION
POLYCYCLIC AROMATIC HYDROCARBONS
PULSE TECHNIQUES
QUANTITATIVE CHEMICAL ANALYSIS
RADIATIONS
SPECTROSCOPY
SUPERSONIC TRANSPORT
TIME-OF-FLIGHT METHOD
TRANSPORT
ULTRAVIOLET RADIATION
WAVELENGTHS