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  • 1
    Electronic Resource
    Electronic Resource
    Molecular ion spectroscopy: Mass selected, resonant two-photon dissociation spectra of CH3I+ and CD3I+ (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 1914-1922 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We present a new ion spectroscopic technique by which it is possible to investigate larger molecular ions by scanning an entire electronic state and coincidentally measuring and, hence, fixing the mass of the fragment ion observed. The technique involves primary resonance excitation together with secondary absorption followed by dissociation as detection process, employing the absorption of two photons in the ion. This method accesses the nondissociating vibronic levels of an electronic state rather than just the narrow range of predissociating levels, as in one-photon dissociation spectroscopy. Spectra of CH3I+ and CD3I+ over a range of 7000 cm−1, beginning at the origin of the A˜ state, were recorded with progression bands up to n=21. These spectra allow for the first time an unambiguous assignment of the A˜←X˜ transition of CH3I+ and CD3I+. The exact positions of the electronic origin as well as of the origin of several progressions and new values for several vibrational constants of methyl iodide cations are reported. Some 300 bands in both ions were measured and assigned with this technique.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455088
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  • 2
    Electronic Resource
    Electronic Resource
    Spectroscopy of the benzene cation: Resonance-enhanced multiphoton dissociation spectra of the B(E"2"g)〈-X(E"1"g) transition
    Amsterdam : Elsevier
    Chemical Physics Letters 155 (1989), S. 8-14 
    Details
    ISSN: 0009-2614
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/S0009-2614(89)87351-8
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  • 3
    Electronic Resource
    Electronic Resource
    Mass-selected molecular ion spectra: (1+1)-Photodissociation spectroscopy of CH"3I^+ and CD"3I^+
    Amsterdam : Elsevier
    Chemical Physics Letters 141 (1987), S. 267-276 
    Details
    ISSN: 0009-2614
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0009-2614(87)85022-4
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  • 4
    Electronic Resource
    Electronic Resource
    Laser spectroscopy of molecular ions: The A˜–X˜ transition of the acetylene radical cation (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 103 (1995), S. 5224-5235 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Resonance-enhanced multiphoton-dissociation spectroscopy has been used to measure the first highly resolved UV spectrum of the acetylene radical cation. The bent structure of the ionic A˜ state could be proved. In the A˜–X˜-spectrum progressions of all three bending modes of bent acetylene appear. Their frequencies, anharmonicities and estimated potential thresholds are given. Furthermore, for the origin and the 5a20 band (out-of-plane cis-bending mode) rotationally resolved spectra have been obtained and rotational constants A, B, and DK have been determined as well as a directly measured value of the X˜-state spin–orbit splitting. From rotational linewidths or envelopes information about single vibrational lifetimes has been deduced; a mode-specific behavior of these lifetimes has been found. Several nonradiative processes involving isomerization to vinylidene seem to be important in the energy region of our spectrum. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.470558
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  • 5
    Electronic Resource
    Electronic Resource
    Laser spectroscopy of molecular ions: The A–X transition in the OCS radical cation (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 101 (1994), S. 8482-8493 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Spectroscopy of the OCS+ ion in its ground and first excited states has been performed over a wide energy range using one-photon dissociation spectroscopy. We used multiphoton ionization in the first step for state selective ion preparation in single well-defined vibrational and spin–orbit states. This simplifies the ion spectra of the transition to the first excited A state considerably and thereover delivers the information of the ion ground state by using hot ion preparation. For the stretching vibrations anharmonicities have been observed and for the first overtone of the bending vibration Fermi resonances have been found. Rotational constants could be determined for the vibrational ground states of the X and A ionic states in both spin–orbit components. A new double resonance technique was applied to measure vibrational frequencies in the ionic X ground state.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.468109
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  • 6
    Electronic Resource
    Electronic Resource
    Efficient and robust anion source, based on a microchannel plate electron source (1999)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 70 (1999), S. 2277-2281 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: In this work, an efficient, cheap, and robust anion source is described, which is based on a high-pressure supersonic expansion crossed with a pulsed high-energy electron beam. The special property of this anion source is "soft" electron attachment and efficient stabilization and cooling, which results predominantly in molecular and cluster anions of intact molecules. As electron source, a stack of microchannel plates is used, which is seeded by photoelectrons generated by a weak ultraviolet light pulse. By this special electron source 109–1010 electrons of 1 keV energy are provided at a pulse width of 150 ns. These operational conditions can be maintained up to a repetition rate of 4 kHz. Further advantages of this device are its long lifetime even at relatively high vacuum pressures and its stability against reactive samples, such as oxygen and organic molecules. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1149752
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  • 7
    Electronic Resource
    Electronic Resource
    Elementary Processes in Peptides: Electron Mobility and Dissociation in Peptide Cations in the Gas Phase (1995)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 99 (1995), S. 11255-11265 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100028a029
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  • 8
    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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  • 9
    Electronic Resource
    Electronic Resource
    Tandem time of flight techniques and multiphoton mass spectrometry: the ladder switching in benzene (1990)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 94 (1990), S. 8567-8573 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100386a016
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  • 10
    Electronic Resource
    Electronic Resource
    Resonant photodetachment via shape and Feshbach resonances: p-benzoquinone anions as a model system (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 110 (1999), S. 304-314 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: For p-benzoquinone anions, the photodetachment spectrum at 0.15–0.65 eV above detachment threshold shows sharp and broad resonances, which we assign to enhanced photodetachment via resonantly excited anion states. The experiment is performed at cold and mass-selected anions to exclude contributions of fragment anions and internally excited molecules. The most prominent, intense and broad spectral feature at 20 200 cm−1 is assigned to an allowed transition from the 2B2g anion ground state to the 2Au shape resonance, which corresponds to a πLUMO*→π* electron promotion. By linewidth we determine an ultrashort lifetime of 25 fs in qualitative agreement with a one-electron autodetachment process. In contrast to this, for the narrow resonances lifetimes between 0.2 and 1.2 ps are determined, in agreement with a slower autodetachment by a two-electron process from Feshbach states. Because of their low photoexcitation cross section they are assigned to dipole and symmetry forbidden n→πLUMO* transitions which can both be only optically active in some vibrations by Herzberg–Teller coupling to the nearby 2Au anion state. The photodetachment photoelectron spectra recorded with wavelengths resonant to some of these excited anion states show that the intensities of the neutral ground state vibrations are mostly determined by the autodetachment process via the excited anion resonance. This shows that the resonant photodetachment is by far the predominant process and not excitation into continuum. The vibrational origin of the anion to neutral transition is situated at 1.860 eV±5 meV and gives directly the electron affinity of p-benzoquinone. The Feshbach and shape states form a dense electronic state ladder, which can enhance fast radiationless relaxation processes, making p-benzoquinone a very efficient electron acceptor in gas phase and in solution. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.478066
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