Surface studies using particle-beam-induced desorption and multiphoton resonance ionization (A)
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Resonance-enhanced multiphoton ionization
Particle (ecology)
Particle beam
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Resonance-enhanced multiphoton ionization
Particle (ecology)
Particle beam
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Get PDF Email Share Share with Facebook Tweet This Post on reddit Share with LinkedIn Add to CiteULike Add to Mendeley Add to BibSonomy Get Citation Copy Citation Text Peter Hansch, Mark A. Walker, and Linn D. Van Woerkom, "Multiphoton Ionization with Precise Intensity Control," Optics & Photonics News 7(12), 23_1-24 (1996) Export Citation BibTex Endnote (RIS) HTML Plain Text Citation alert Save article
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Multiphoton ionization spectroscopy provides the sensitivity needed to approach single molecule detection. Extremely high detection selectivity is required to utilize this sensitivity in practical applications. We are investigating the fundamental aspects of multiphoton ionization and fragmentation processes that influence selective detection of aromatic hydrocarbons. The objective is to be able to combine the ionization spectrum of the neutral molecule with fragmentation spectra of parent and daughter ions to improve selective detection. We have observed parent ion fragmentation spectra for aromatic molecules in room temperature environments and in cooled supersonic beams. Although the parent ion fragmentation spectra reveal strong transitions in red spectral regions, isolated from the neutral molecule UV transitions, the ion transitions are spectrally congested when observed in room temperature ionization cells. We report on our most recent observations of parent ion fragmentation spectra measured in a cooled supersonic beam environment.
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Dynamics
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Abstract We review the main experimental results obtained in the multielectron multiphoton ionization of rare gases. Multiple ionization is interpretated as a sequential process. We study the influence of many‐electron effects in multiphoton ionization within the framework of the random phase approximation. This is applied to a calculation of the two‐photon ionization cross section of xenon. Finally, the role of screening effects in the multiphoton stripping of heavy atoms (Xe) is estimated.
Atmospheric-pressure laser ionization
Stripping (fiber)
Thermal ionization
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Atmospheric-pressure laser ionization
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Linear polarization is shown to dominate circular polarization cross sections strongly for high-order multiphoton ionization of atoms.Received 12 September 1972DOI:https://doi.org/10.1103/PhysRevLett.29.1129©1972 American Physical Society
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