Resonant two-photon ionization spectroscopy in supersonic beams for discrimination of disubstituted benzenes in mass spectrometry
Journal Article
·
· Anal. Chem.; (United States)
Supersonic molecular beam spectroscopy has great potential for selectivity in chemical analysis. In this work we have used resonant two-photon ionization (R2PI) spectroscopy in supersonic beams of argon as a means of obtaining ultraviolet ionization spectra with sharp features for unique identification of species in a mixture. This technique, therefore, provides a wavelength-selective means of forming ions for detection in time-of-flight mass spectrometry. The spectroscopy of several disubstituted benzenes including p-cresol, p-toluidine, p-aminophenol, p-fluoroaniline, p-fluorophenol, and hydroquinone has been studied near their origin transitions. These molecules have low quantum yields in fluorescence but can be detected with great sensitivity (< 20 ppb) by using laser ionization. On the basis of the separation between spectral lines of compounds in various mixtures, we estimate the combined maximum discrimination possible in a mass spectrometer, thus demonstrating the capability of this technique for identification. When this method is used, an experimental discrimination between p-cresol and p-fluoroaniline on the order of 1:5000 can in principle be obtained.
- Research Organization:
- Univ. of Michigan, Ann Arbor
- OSTI ID:
- 5671440
- Journal Information:
- Anal. Chem.; (United States), Journal Name: Anal. Chem.; (United States) Vol. 56:14; 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)
AMINES
ANILINE
AROMATICS
CHEMICAL ANALYSIS
CRESOLS
DATA
DYE LASERS
ELECTROMAGNETIC RADIATION
EXPERIMENTAL DATA
HYDROXY COMPOUNDS
INFORMATION
LASERS
LIQUID LASERS
MASS SPECTROSCOPY
MEASURING INSTRUMENTS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
PHENOLS
QUANTITATIVE CHEMICAL ANALYSIS
QUINONES
RADIATIONS
RESONANCE IONIZATION MASS SPECTROSCOPY
SPECTROMETERS
SPECTROSCOPY
TIME-OF-FLIGHT SPECTROMETERS
TRACE AMOUNTS
ULTRAVIOLET RADIATION
400104* -- Spectral Procedures-- (-1987)
AMINES
ANILINE
AROMATICS
CHEMICAL ANALYSIS
CRESOLS
DATA
DYE LASERS
ELECTROMAGNETIC RADIATION
EXPERIMENTAL DATA
HYDROXY COMPOUNDS
INFORMATION
LASERS
LIQUID LASERS
MASS SPECTROSCOPY
MEASURING INSTRUMENTS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC FLUORINE COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
PHENOLS
QUANTITATIVE CHEMICAL ANALYSIS
QUINONES
RADIATIONS
RESONANCE IONIZATION MASS SPECTROSCOPY
SPECTROMETERS
SPECTROSCOPY
TIME-OF-FLIGHT SPECTROMETERS
TRACE AMOUNTS
ULTRAVIOLET RADIATION