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  • 1
    Electronic Resource
    Electronic Resource
    Mass selected anion-zero kinetic energy photoelectron spectroscopy (anion-ZEKE): Ground and low excited states of FeO (1997)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 107 (1997), S. 2284-2291 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Photodetachment-photoelectron (PD-PES) and anion-zero kinetic energy photoelectron (anion-ZEKE) spectra of FeO have been measured. The vibrational progression bands of the X 5Δi(FeO)←X 5Δ7/2(FeO−) transition in the PD-PES spectrum exhibit substructure which could not be resolved in earlier PD-PES spectra. A comparison with the high resolution anion-ZEKE spectrum clearly shows the existence of a second low energetic electronic state which could be the a 7Σ+ of neutral FeO proposed by several authors. In addition, for the A 5Σ+ state of FeO an excess energy of 4050 cm−1 was found. Vibrational frequencies for the X 5Δ, a 7Σ+, and A 5Σ+ states have been determined as 882, 887, and 800 cm−1. All spin orbit splittings of the neutral and anionic ground states could be measured directly or deduced from spin orbit combination transitions. We succeeded in resolving the rotational envelope of the vibrational origin of the neutral–anion ground states transition with indicated single rotational lines of the ΔJ =+3/2 branch. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.474622
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  • 2
    Electronic Resource
    Electronic Resource
    Ionization, charge separation, charge recombination, and electron transfer in large systems (1992)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 96 (1992), S. 10608-10616 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100205a010
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  • 3
    Electronic Resource
    Electronic Resource
    Femtosecond versus Nanosecond Multiphoton Ionization and Dissociation of Large Molecules (1994)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 98 (1994), S. 8381-8391 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100085a019
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  • 4
    Electronic Resource
    Electronic Resource
    How Large Are High Molecular Rydberg States? A Direct Experimental Test (1995)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 99 (1995), S. 1660-1665 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100006a007
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  • 5
    Electronic Resource
    Electronic Resource
    Transit detector for intermediate monitoring in time-of-flight mass analyzers (1994)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 65 (1994), S. 3172-3177 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We present a particle detector for intermediate monitoring of beams of ion bunches (e.g., in time-of-flight mass analyzers). Its principle is secondary electron emission from a thin wire whose cross section is small (i.e., 〈5%) compared with the cross section of the primary ion beam. By means of a special experimental setup, anionic, cationic, or neutral particle beams can be formed; in addition, a tandem arrangement of our transit detector and a second detector at the end of the ion flight region allows us to test this transit detector. The influence on mass resolution, reliability of ion peak heights, dependence on kinetic energy and charge of the primary particles, and linearity have been investigated. This new detector may be useful for tandem mass spectrometric experiments, e.g., in time-of-flight analyzers with secondary excitation by collisions or photon absorption.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144546
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  • 6
    Electronic Resource
    Electronic Resource
    Calibration method for the quantitative analysis of gas mixtures by means of multiphoton ionization mass spectrometry (1993)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 64 (1993), S. 3482-3486 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A technique for quantitative analysis of gas mixtures in a laser mass spectrometer is presented. It is based on the addition of two calibration gases with different orders of multiphoton ionization process to the sample gas. The ratio of the signals of these two internal standards serves as a sensor for the laser intensity within the ionization volume. Thus strongly fluctuating signals due to higher-order multiphoton ionization can be normalized for every single laser shot. In addition, for such a relative measurement, effects of long-term drifts of the apparatus are eliminated. Concentrations varying from a few ppm to several percent could be determined with an accuracy better than 10% at every single laser shot. Therefore this technique allows high time resolution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144272
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  • 7
    Electronic Resource
    Electronic Resource
    Production and unimolecular decay rate of rotationally selected polyatomic molecular ions (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 6182-6190 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We present the first example of unimolecular decay rates of a polyatomic system in which reactions are rotational state selected. Internal energy specification, including the selection of the J-rotational angular momentum quantum number, is achieved via a two laser pump–pump experiment. The first laser pumps selected rotational features in the 601 transition of the neutral molecule and creates vibrationally and rotationally state selected ions following 1+1 two-photon absorption. A second laser further excites the state selected ions to an energy of 5.3 eV which is above the dissociation threshold for four competing decay channels of the benzene cation. Slow reactive decay of these ions is observed in a reflectron time-of-flight mass spectrometer and the total decay rate constant k(E,J) is measured as a function of J while keeping the energy of the second laser constant. The results are compared with calculations based on a modified RRKM model that includes consideration of the J dependence of the decay rate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454457
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  • 8
    Electronic Resource
    Electronic Resource
    Laser measurements of the unimolecular kinetics of energy-selected molecular ions: Isotope effects in benzene (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 87 (1987), S. 6488-6498 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Metastable ion decay rates for isotope decay channels differing only by one mass unit have been measured in a reflectron mass spectrometer with high mass resolution. Several decay channels with H, H2, C2H2, and C3H3 (and their isotopic analogs) elimination from C6H+6, C6D+6, and C6D5H+ are investigated. We present examples of intermolecular and for the first time of intramolecular kinetic isotope effects for internal energy selected reactants. The reaction coordinate for the decay channels can be characterized as C–H or alternatively as C–C stretching vibrations and the total looseness of the activated complex with respect to the remaining 3N−7 vibrations can be attributed to the subsets of the C–H and C–C vibrations. Furthermore, from the good agreement of RRKM calculations and all inter- and intramolecular isotopic results for a given decay channel it is concluded that C–H vibration participate in the random energy flow before dissociation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.453431
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  • 9
    Electronic Resource
    Electronic Resource
    High resolution zero kinetic energy photoelectron spectroscopy of benzene and determination of the ionization potential (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 4737-4744 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We report the direct high-resolution determination of the ionization potential of benzene and the observation of rotational structure in the vibronic ground state of the benzene ion. We employ a new technique of two-color high-resolution zero kinetic energy photoelectron spectroscopy (ZEKE-PES) via selection of an intermediate resonant (neutral) state. The ZEKE-PES method allows for the investigation of rotationally resolved photoionization dynamics and the direct high-precision determination of ionization potentials, the precision being derived directly from the laser wavelength calibration. For benzene we determine an IP of 74 555.0±0.4 cm−1. We compare this method to ionization potential measurements from ion yield measurements under various conditions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.452694
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  • 10
    Electronic Resource
    Electronic Resource
    Spectra of isotopically mixed benzene dimers: Details on the interaction in the vdW bond (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 85 (1986), S. 1726-1732 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Isotopically mixed jets of benzene produced the various possible isotopic benzene dimers in a supersonic jet. Mass coincidence in time-of-flight multiphoton mass spectra separated the spectra due to the various dimers produced into distinguishable spectra even in the presence of overlap. From the many different isotopic spectral shifts a detailed model of interaction between the two halves of the dimer can be established revealing detailed new information on this interaction. In particular a splitting in the 0–0 transition is reported for the first time indicating an exciton interaction in the dimer of isotropic identical benzene molecules in the gas phase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.451173
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