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  • 1
    Electronic Resource
    Electronic Resource
    The structures of C2H+ and C2H+2 as measured by Coulomb explosion imaging (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 6377-6387 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The structures of ethynyl and acetylene cations were investigated utilizing the Coulomb explosion imaging method. The geometrical probability density functions for the bending modes were obtained for the protonated and deuterated forms of each species. Detailed analyses of the data reveal that both the measured linear equilibrium geometries and the observed extent of the correlated bending vibrations agree with ab initio calculations for C2H+2 and C2D+2. C2H+ and C2D+ are found to be linear, but the extent of the bending amplitudes are by far larger than the corresponding theoretical predictions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.460316
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  • 2
    Electronic Resource
    Electronic Resource
    Measurement of the distribution of bond angles in H2O+ (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 2543-2547 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A quantitative analysis of the bending mode of H2O+ is made using the Coulomb Explosion technique. The full extent of the angular distribution is measured and is in good agreement with the previously measured bending frequency. The equilibrium value for the angle is extracted from the data with high precision and is in excellent agreement with theoretical predictions as well as spectroscopic measurements.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459881
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  • 3
    Electronic Resource
    Electronic Resource
    A new type of multiparticle imaging detector (1990)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 61 (1990), S. 945-952 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: The foil-induced dissociation of molecular ions can provide a direct image of the stereochemical structures of small molecules. Such experiments require high-resolution measurements of the relative momenta of all dissociation fragments. In order to improve and extend previous studies of this type to a larger variety of molecules and clusters, we have developed a new type of low-pressure multiwire proportional counter. The novel feature of this large-area (25×50 cm2 ) multiparticle detector is that all the signals are recorded from a single two-level printed circuit board which serves as the anode. This segmented anode consists of three families of nonintersecting "wires'' which are interwoven on the rear surface of the board. By redundantly determining positions and arrival times, the new segmented anode multiparticle detector provides good time resolution (100–200 ps) and high spatial resolution (0.2 mm) for detecting as many as six simultaneous particles.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1141447
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  • 4
    Electronic Resource
    Electronic Resource
    Low-energy stripping of Kr+, Xe+, and Pb+ beams in helium and nitrogen (1997)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 68 (1997), S. 2322-2327 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Stripping efficiencies for Kr+, Xe+, and Pb+ beams in helium and nitrogen gas targets have been measured at energies varying between 0.8 and 2.0 MeV. The stripping yields were determined for different target densities, ranging from single-collision conditions to equilibrium. Based on these results, approximate predictions of the equilibrium charge state distributions for low velocity (v/c=0.0040–0.0060) heavy ions with 28〈Z〈92 in collisions with helium atoms are made. Furthermore, measurements of the small-angle scattering of these heavy ion beams in collisions with dilute helium and nitrogen gases are reported. The presented results are important in view of a proposed postacceleration scheme for low-energy radioactive ion beams using a linac. These data show that helium generally produces higher yields of 2+ and 3+ ions and that the optimal choice of gas thickness for the proposed application is somewhat less than that required for equilibrium. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1148167
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  • 5
    Electronic Resource
    Electronic Resource
    A source of cold molecular ions for Coulomb explosion imaging (1992)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 63 (1992), S. 3569-3574 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A specialized ion source for use in the high voltage terminal of an electrostatic accelerator has been developed to produce vibrationally cold beams of molecular ions. A pulsed valve is used to produce a supersonic expansion of the source gas which is ionized by electron impact near the beginning of the free expansion. Because of the harsh electromagnetic environment in the terminal, special care has been taken to protect the electronic components related to the ion source. The effect of vibrational cooling in the supersonic expansion is demonstrated using Coulomb explosion techniques with a He2+ beam.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143766
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  • 6
    Electronic Resource
    Electronic Resource
    Ultrathin foils for Coulomb-explosion experiments (1987)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 58 (1987), S. 424-427 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We have examined the properties of very thin foils used for electron stripping of MeV molecular ions in Coulomb-explosion experiments. Carbon foils with a nominal thickness of 0.2 μg/cm2 proved to be thicker than 1 μg/cm2. It was not possible to reduce their thickness by bombardment with 2-MeV Kr+ or H2O+ ions or by heating to a red glow. We succeeded in producing Formvar films of about 0.5 μg/cm2, which are supported by a nickel mesh.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1139248
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  • 7
    Electronic Resource
    Electronic Resource
    Geometrical structure of carbon ion (C3+) (1987)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 91 (1987), S. 6445-6447 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100310a002
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  • 8
    Electronic Resource
    Electronic Resource
    CH2+ is bent (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 98 (1993), S. 7725-7729 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The Coulomb explosion imaging (CEI) technique has been applied to a beam of vibrationally cold CH2+ molecular ions and the distribution of bond angles was extracted. From these data, we are able to demonstrate conclusively that the electronic ground state potential of this molecule has a C2v minimum and that the zero-point energy lies below the potential barrier to linearity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.465090
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  • 9
    Electronic Resource
    Electronic Resource
    A measurement of the low energy stereostructure of protonated acetylene, C2H+3 (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 85 (1986), S. 7487-7488 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A new experimental method for obtaining detailed structural informatio on small polyatomic molecular ions is presented. The low−energy structure of protonated acetylene has been studied using this method.(AIP)
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.451338
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