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- W151869737 abstract "This article deals with possible analytical applications of a newly developed technique, laser ionization mass spectrometry. The instrument is a “laser mass spectrometer” (LAMS), whose essential new features consist of a pulsed, tunable-dye-laser ionization source and a gated-detection system for the mass-separated ions. Multiple photon ionization (MPI) spectra of isolated molecules are obtained via irradiation (by means of the pulsed, tunable laser) of a molecular beam traversing the ion-source region of a mass spectrometer. At each resonance in the vibronic MPI spectrum, a mass spectral fragmentation pattern can be recorded, yielding the branching fractions for the formation of the different ionic products. Such “two- dimensional” vibronic/ mass spectra are highly specific: every molecule (and each of its isotopic variants) has a unique MPI-mass spectrum. Ionization and fragmentation thresholds in the 10–20 eV range have been reached using readily available 2–3 eV laser photons. Thus the laser ionization mass spectrometer has many of the desirable atttributes of a far UV (e.g., synchrotron radiation) photoionization mass spectrometer, such as wavelength selectivity, but LAMS can provide higher peak photon flux densities and thereby access one-photon-forbidden intermediate states. Results on vibronic/ mass spectra of benzene and other polyatomic molecules are discussed. Consideration is given to such questions as the present practicality, ultimate sensitivity, and future analytical potential of laser ionization mass spectrometry." @default.
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- W151869737 date "1981-01-01" @default.
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- W151869737 title "Potential Analytical Aspects of Laser Multiphoton Ionization Mass Spectrometry" @default.
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- W151869737 doi "https://doi.org/10.1007/978-1-4612-6009-7_6" @default.
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