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  • 1
    Electronic Resource
    Electronic Resource
    Photoelectron circular dichroism of the randomly oriented chiral molecules glyceraldehyde and lactic acid (2000)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 112 (2000), S. 301-310 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The differing interaction of left and right circularly polarized light with chiral molecules is shown to lead to different angular distributions of the photoelectrons created by photoionization of a given enantiomer, even when the target molecules are randomly oriented. Numerical calculations are presented to demonstrate the magnitude of this effect for the C3H6O3 structural isomers lactic acid and glyceraldehyde, including two different conformations of the latter. Circular dichroism in the angular distributions (CDAD) of the valence electrons of these biomolecules is most pronounced close to threshold, but tends to vanish as the electron kinetic energy approaches 20 eV and above. CDAD signals are predicted to range, typically, from 10% to 40% and sometimes to more than 60% of the differential cross section. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.480581
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  • 2
    Electronic Resource
    Electronic Resource
    The 5a1−1 photoionization of oriented CF3I molecules: Angular distributions of the ka1 and ke photoelectron continua (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 111 (1999), S. 4535-4547 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Molecule-frame photoelectron angular distributions are obtained by the measurement of electron–ion recoil vector correlations in the dissociative 5a1−1 photoionization of CF3I. The laboratory frame orientation of an ionized molecule is inferred from the CF3+ fragment ion recoil direction and the contributions of radiation polarized perpendicular and parallel to the molecular axis can be estimated. This allows the degenerate ka1 and ke continua to be distinguished, each having a distinctive angular distribution. Experimental data are compared with calculated fixed-molecule photoelectron angular distributions. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.479215
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  • 3
    Electronic Resource
    Electronic Resource
    Oriented molecule photoelectron angular distributions in the vicinity of a photoionization shape resonance: Continuum multiple scattering-Xα calculations for valence ionization of CF3Cl (1997)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 106 (1997), S. 5013-5027 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The potential use of fixed molecule photoelectron angular distributions (PADs) as a detailed probe of photoionization dynamics is explored using Continuum Multiple Scattering-Xα calculations for the molecule CF3Cl. A number of dynamical phenomena (various shape resonances and a Cooper minimum) encountered in the vuv photoionization of CF3Cl up to 70 eV are examined. Cross-sections and asymmetry parameters are also reported and the nature of the low energy shape resonances is examined using eigenchannel plots. These show a clear correspondence between the present scattering calculations and the alternative description of shape resonances as antibonding virtual valence orbitals. PADs from fixed in space molecules are predicted to show a pronounced orientation, favoring electron emission from one end of the molecule. After passing through a shape resonance this orientation can flip direction as a consequence of resonant phase shifts in the interfering partial waves. Resonant electron-ion interactions can also result in greater alignment of the electron's orbital angular momentum with the molecular axis; the corollary is that the PAD becomes less strongly aligned or oriented along this direction at the resonance energy. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.473549
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  • 4
    Electronic Resource
    Electronic Resource
    Background correction in electron-ion coincidence experiments using a self-optimizing, pseudorandom count generator (1998)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 69 (1998), S. 3142-3145 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A technique is described whereby an estimate of the false coincidence signal, suitable for background correction of data acquired in a coincidence experiment, is obtained by using a pseudorandom pulser to generate a stream of "false" start events. The statistical properties of this simulated source are adjusted to mimic those of the real source of electron start events. False ion coincidences with the simulated starts are measured concurrently with the real coincidence signal, with the mean count rate of the pseudorandom pulse source automatically tracking that of the true electron start events. In this manner any long term instrumental drifts during the course of an extended experimental measurement will similarly affect both the real and simulated coincidence data. Subtraction of the simulated background of false coincidences from the real coincidence data then yields an improved estimate of the true coincidence signal. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1149074
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  • 5
    Electronic Resource
    Electronic Resource
    Parallel, multichannel energy and angle resolving electrostatic electron analyzer (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 3807-3818 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A new charged particle analyzer offering parallel and multichannel detection of a range of emitted energy and angle is described. Simultaneous multiplex detection of both these variables is achieved with the use of a two-dimensional position sensitive detector. The instrument is so arranged that angular information is recovered from the azimuthal coordinate, and energy from the radial coordinate of each detected particle. The instrument is based upon the original ‘Bessel Box' design of Allen and co-workers and shares many of the favorable characteristics of that analyzer. General theoretical principles are considered and assessed, and then the actual performance of a specific device, fabricated for use in an angle resolved UV photoelectron-photoion coincidence experiment is reported. Simple in situ control of the operational mode of the instrument is described and demonstrated with the prototype, allowing convenient selection of the most effective compromise between resolution and bandwidth. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1145442
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  • 6
    Electronic Resource
    Electronic Resource
    Energy redistribution in unimolecular ion dissociations (1987)
    s.l. : American Chemical Society
    Accounts of chemical research 20 (1987), S. 179-185 
    Details
    ISSN: 1520-4898
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ar00137a004
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  • 7
    Electronic Resource
    Electronic Resource
    Photoelectron–photofragment ion recoil vector correlations in the dissociative photoionization of PF3 at He i and Ne i ionizing wavelengths (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 3436-3443 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A comparative study of the photoionization and dissociation of the A state of PF3+ at two different resonance line ionizing wavelengths (He i and Ne i) is presented. Using a photoelectron–photoion coincidence (PEPICO) technique, energy selected ions are prepared and fragment ion kinetic energy distributions derived. The energetics and dynamics of the ion fragmentation process are discussed and a simple impulsive dissociation model is proposed. An angular correlation between the recoil directions of ejected electrons and fragment ions is identified and is especially pronounced for the He i data. An interpretation in terms of an anisotropic body-frame photoelectron angular distribution is presented, from which the likely presence of a shape resonance in the A state photoionization dynamics around λ=584 A(ring) is inferred. This accords with the observation of resonances in core photoionization studies of PF3.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.465153
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  • 8
    Electronic Resource
    Electronic Resource
    Photoion anisotropy in dissociative photoionization of CF3I (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 1643-1652 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Dissociative photoionization of CF3I is studied in the region of the CF3I+ A state (13–15 eV). We observe a pronounced anisotropy of the I+ fragment ions in the time of flight coincidence spectra obtained at 14.24 and 15.0 eV photon energy, but having the same 13.3 eV parent ion internal energy. It is the result of a strong alignment in the photoionization process at these energies, probably related to a specific autoionization process. A new and lower value of 13.40±0.05 eV is measured for the appearance potential of the CF2I+ fragment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458098
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  • 9
    Electronic Resource
    Electronic Resource
    Rotational structure and predissociation dynamics of the methyl 4pz(v=0) Rydberg state investigated by resonance enhanced multiphoton ionization spectroscopy (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 3986-3992 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The vibrationless bands of the methyl 4p 2A‘2 ←X˜ 2AA‘2 0–0 Rydberg transition have been recorded by mass selected (2+1) REMPI spectroscopy using photolytically generated CH3 and CD3 radicals. A least-squares analysis of the spectra determines values for the band origin and the rotational constants B', D'N, DNK, and (C'−C‘). Linewidths in the CH3 spectrum show a pronounced rotational level dependence and by means of a spectral simulation a heterogeneous predissociation is identified and shown to be induced by a perpendicular Coriolis coupling mechanism.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454832
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  • 10
    Electronic Resource
    Electronic Resource
    Energetics and dynamics in the dissociative photoionization of PF3 at 21.2 eV (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 8895-8900 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The first five electronically excited states of PF+3 generated by He i photoionization are found to dissociate exclusively to PF+2 with dynamically distinct mechanisms. A pronounced correlation is observed between the direction of ejection of the photoelectron and the photofragment ion which issue from individual photoionization events, from which it is inferred that both the photoelectron emission and the subsequent unimolecular ion dissociation are highly anisotropic processes. Measurement of the kinetic energy which accompanies PF+2 formation at its experimental onset is used to identify the preferred thermochemical threshold value for this ion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.461222
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