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  • 1
    Electronic Resource
    Electronic Resource
    Pulse radiolysis studies of the lowest triplet state of benzene in the gas phase (1978)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 82 (1978), S. 2373-2377 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100511a005
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  • 2
    Electronic Resource
    Electronic Resource
    Deexcitation of He(2 1P) in collisions with diatomic molecules (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 3180-3186 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Deexcitation cross sections of He(2 1P) by N2 and O2 have been measured using a pulse radiolysis method in a region of the mean collisional energy between 18 and 38 meV. Fairly large deexcitation cross sections ((approximately-equal-to)100 A(ring)2) by N2 and the negative slope of the curve of cross section vs energy are interpreted in terms of the energy transfer cross section based on a dipole–dipole interaction. Validity of theoretical formula based on a semiclassical approach with rectilinear trajectories, i.e., the Watanabe–Katsuura formula, is discussed. The deexcitation cross section of He(2 1P) by O2 and its collisional energy dependence are not very different from that by N2. Optical model calculation of the deexcitation cross section has been also presented for collisions between He(2 1P) and M (M=H2 or N2) with an isotropically averaged complex potential optimized through a fitting procedure to the experimental cross sections. It has been found by the model calculation that an electron exchange interaction is not negligible in the deexcitation process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.463957
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  • 3
    Electronic Resource
    Electronic Resource
    Electron–ion recombination rate constants in gaseous and liquid krypton (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 2386-2391 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Electron drift mobilities μe and electron–ion recombination rate constants kr have been measured by the analysis of transient current induced with the irradiation of an x-ray pulse on gaseous or liquid krypton in a cell as a function of external electric field strength. The effects of an external dc electric field on kr up to 12 mTd (1 Td=10−17 V cm2/molecule) in liquid and 63 mTd in gas have been examined. The observed kr values in both liquid and gas phases have been found to be much smaller than those calculated by the reduced Debye equation. The deviation has been compared with recent theoretical studies, leading to the conclusion that recombination in liquid and gaseous krypton is not the usual diffusion-controlled reaction. The kr values in the gas phase increase with an external dc electric field up to a critical electric field strength below which μe values are nearly constant, and above which both kr and μe values descrease with further increase in the electric field for both gaseous and liquid phases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.463077
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  • 4
    Electronic Resource
    Electronic Resource
    Absolute measurements of photoabsorption and photoionization cross sections of disilane in the 13–40 eV region (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 6188-6189 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.461593
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  • 5
    Electronic Resource
    Electronic Resource
    Deexcitation cross sections of He (2 3S, 2 1S, and 2 1P) by molecules containing group-IV elements (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 3289-3296 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Deexcitation cross sections of He(2 3S), He(2 1S), and He(2 1P) by C2H6, Si2H6, CF4, SiF4, and SiCl4 have been measured at a mean collisional energy corresponding to room temperature (295 K) and compared systematically with those by CH4, SiH4, and GeH4 (previously reported) to understand general features of the cross section values dependent on both the electronic states of excited helium atoms and the target molecules containing group-IV elements and to substantiate further the deexcitation mechanism. In the de-excitation of the metastable atoms, He(2 3S) and He(2 1S), the magnitude of the cross sections has mainly been ascribed to a short-range electron exchange interaction. The obtained cross section values for He(2 3S) are compared with a semiempirical formula and it is concluded that the number of the equivalent electrons which can be ionized with the excitation energy of He(2 3S) and the lowest ionization potential of the target molecule are of great importance in determination of the cross section values. Systematic comparisons of the deexcitation cross section values of the resonant atom, He(2 1P), with theoretical ones have shown an importance of not only deexcitation transition mainly ascribed to a long-range dipole–dipole interaction between He(2 1P) and a target molecule but also a bent trajectory caused by an attractive interaction potential between them to determine the cross section values.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.463017
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  • 6
    Electronic Resource
    Electronic Resource
    Deexcitation cross sections of Ar(3P2, 3P1, 3P0, and 1P1) by CH4, SiH4, and GeH4 (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 4372-4377 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Deexcitation cross sections of Ar(3P2), Ar(3P1), Ar(3P0), and Ar(1P1) by CH4, SiH4, and GeH4 have been measured. The cross section values obtained are largely dependent on both the electronic states of excited argon atoms and the target molecules. The magnitude of these values is discussed in terms of energy transfer mechanisms or interactions responsible for the deexcitation transition. In the deexcitation of the metastable atoms, Ar(3P2) and Ar(3P0), the magnitude of the cross sections is mainly ascribed to the adiabatic transition from the interaction potentials for Ar*–M (M=CH4, SiH4, and GeH4 ) to those for Ar–M* due to a long-range potential curve crossing, while in the deexcitation of the resonant atoms, Ar(3P1) and Ar(1P1), the magnitude is mainly ascribed to resonant energy transfer due to a long-range dipole–dipole interaction.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.462829
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  • 7
    Electronic Resource
    Electronic Resource
    Optical model calculation of the total Penning ionization cross sections for He(2 1P)–Ar, Kr, and Xe (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 8187-8193 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Quantum mechanical calculation of the total Penning ionization cross sections for He(2 1P) –Ar, Kr, and Xe collisions has been made in the region of the collisional energy from 0.1 meV to 1 eV with an optical complex potential approach for an electronic transition. The real part of an optical potential at long range is expressed in an explicit dispersion form and that in a repulsive region is expressed in a shielded Coulomb form. We have determined a repulsive potential by an excellent fit with our experimental cross sections. The imaginary part of the optical potential at long range is expressed by a dipole–dipole autoionization width, and at a small interatomic distance an electron exchange width is also considered to account an exponentially dispersive increase of the autoionization width. Good agreement between the present calculation and the experimental data has been obtained both in the energy dependence and in the absolute cross section values. The real part of the optical potential for He(2 1P) –Ar, Kr, or Xe is analogous to that for He(2 1S) –Ar, Kr, or Xe, respectively. It has been found that the width for the electron exchange effectively increases the total Penning ionization cross section, particularly in the case of He(2 1P) –Xe.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.462323
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  • 8
    Electronic Resource
    Electronic Resource
    Ionizing and nonionizing decays of superexcited acetylene molecules in the extreme-ultraviolet region (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 4142-4153 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Absolute measurements of the photoionization and photodissociation cross sections of C2H2 have been made using continuum monochromatized synchrotron radiation in the 53–93 nm region. The absolute photoabsorption cross section and photoionization quantum yield of C2H2 have also been measured. The excitation spectra of C2(d 3Πg→a 3Πu), C2(C 1Πg→A 1Πu), CH(A 2Δ→X 2Π), and H(Lyman-α) fluorescence have also been obtained. The obtained results have been compared with theoretical calculations. An unresolved problem of the spectral interpretation concentrated on the σ * and π* shape resonances has been clarified by the straightforward demonstration of the photoionization quantum yield. The ionizing and nonionizing decay processes of the superexcited C2H2 molecules have been discussed in view of the strong competition of autoionization and neutral dissociation. An overlapping nature of Rydberg states with the shape resonance is found to be important.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.460770
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  • 9
    Electronic Resource
    Electronic Resource
    Photoabsorption, photoionization, and neutral dissociation cross sections of dimethyl ether and ethyl methyl ether in the extreme-ultraviolet range (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 4911-4917 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The absolute photoionization and neutral dissociation cross sections of dimethyl ether (CH3OCH3) and ethyl methyl ether (CH3CH2OCH3) in the 52–92 nm range have been obtained by measuring the absolute photoabsorption cross sections and photoionization quantum yields using a multistage ionization chamber and synchrotron radiation. A large deviation in the photoionization quantum yield of both molecules from unity, namely a noticeable enhancement of the neutral fragmentation cross sections, has shown that superexcited states exist densely in this wavelength range. Fluorescence excitation spectra of neutral dissociation fragments produced in the 35–100 nm photon impact on both molecules have also been measured by observing ultraviolet and vacuum ultraviolet emissions. A general appearance of the neutral dissociation cross sections correlates with the fluorescence excitation spectra from H(n=2), CH(A 2Δ), and CH3O(A˜). The superexcited states of dimethyl ether observed are shown to be purely repulsive states or bound states for which the lowest energy level achieved from the Franck–Condon region is higher than the dissociation limit. Dissociation of ionic satellites have also been observed in the fluorescence excitation spectra of both molecules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.462781
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  • 10
    Electronic Resource
    Electronic Resource
    Autoionizing-resonance enhanced preferential photodissociation of CO2 in superexcited states (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 97 (1992), S. 2835-2842 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Fluorescence excitation spectra of CO2+(A˜ 2Πu→X˜ 2Πg), (B˜ 2∑u+→X˜ 2Πg), and CO(A 1Π→X 1Σ) emissions produced in the photoionization and neutral photodissociation of CO2 have been obtained in the 30–92 nm region. A strong competition between autoionization and neutral dissociation observed in the region near the ionization thresholds to form CO2+(A˜ 2Πu) and CO2+(B˜ 2Σu+) states clearly shows the preferential enhancement of the neutral dissociation, which is explained mainly by the intrinsic autoionization rate of the individual superexcited Rydberg states. A drastic step-down decrease in a fluorescence excitation spectrum in the vacuum ultraviolet region at the thresholds has been ascribed to a dramatic density dilution of the superexcited states into the continuum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.463026
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