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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 93 (1989), S. 2461-2470 
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 1643-1652 
    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
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  • 3
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 3986-3992 
    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
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  • 4
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 8895-8900 
    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
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  • 5
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 3436-3443 
    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
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  • 6
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 3807-3818 
    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
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  • 7
    Electronic Resource
    Electronic Resource
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 69 (1998), S. 3142-3145 
    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
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  • 8
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 99 (1995), S. 12371-12374 
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Accounts of chemical research 20 (1987), S. 179-185 
    ISSN: 1520-4898
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 103 (1995), S. 5570-5589 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Photoelectron angular distributions (PADs) from the ionization of fixed-in-space, oriented PF3 molecules have been computed using the CMS-Xα method. These molecule frame distributions are richly structured and varied with a high harmonic content. Interference terms between odd- and even-partial waves create orientation in the PAD, and in some instances such oriented PADs may undergo a dramatic inversion, or reversal of direction, at a shape resonance. This phenomenon is attributable to the rapid rise in scattering phase of a single resonant partial wave component. A previously observed reversal in the experimental PF3 A˜ band correlated photoelectron–photofragment ion recoil direction can be understood in these terms. Good agreement is found between the experimental and calculated molecule frame anisotropy for ionization of the 4e orbital over a range of electron kinetic energies. The assignment of the A˜ band is thereby clarified, and the presence of a 4e→ka1(σ*) shape resonance at ∼3 eV can be confirmed without the necessity to scan through the resonance energy. Other shape resonances in the range 0–25 eV are identified by the calculations; all are investigated and the resonant behavior is scrutinized with the assistance of continuum eigenchannel plots. In this manner different trapping mechanisms can be visualized and the localization of the continuum scattering functions related to virtual atomic and molecular orbitals embedded in the ionization continuum. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
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