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  • 1
    Electronic Resource
    Electronic Resource
    S2(a 1Δ) production in the reaction of S 1D atoms with COS: Spectroscopy and dynamics (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 109 (1998), S. 8876-8886 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The reaction S(1D)+COS(X 1Σ+)→S2(a 1Δ)+CO(X 1Σ+) has been studied using pulsed photolytic production of S(1D) together with laser-induced fluorescence detection of S2(a 1Δ). S(1D) was produced by 212.8 nm (Nd:YAG fifth harmonic) photolysis of OCS. The nascent S2(a 1Δ) product has been observed under single collision conditions. Rotational and vibrational population distributions for excited S2(a 1Δ) have been obtained. The observed vibrational distribution was analyzed using surprisal analysis and was found to be much colder than predicted by purely statistical arguments, although it extends to at least v=6. A rotational population distribution was obtained for v=2 of the S2(a 1Δ) state. It shows a maximum around J=45, which is hotter than thermal but much colder than the statistical prediction. Resolved emission experiments were performed to verify calculated Franck–Condon factors for the S2 f 1Δ–a 1Δ transition. Ab initio calculations suggest several possible routes leading from reactants to products in the singlet reaction channel but predict significant reaction barriers for the triplet channel. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.477559
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  • 2
    Electronic Resource
    Electronic Resource
    Resonance enhanced multiphoton ionization spectroscopy of the NF molecule: 1,3Φ 3d and 4d Rydberg states (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 102 (1995), S. 1515-1527 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The (3dδ)1,3Φ and (4dδ)1,3Φ Rydberg states of NF have been investigated by multiphoton ionization (MPI) spectroscopy. These states were observed as two-photon resonances in an overall (2+1) MPI process from NF a1Δ produced from the F+N3 reaction. Ab initio calculations performed at the multireference double excitation configuration interaction level showed that the excited Φ states were of Rydberg character with configurations of ...1π45σ22π1(3dδ)1 and ...1π45σ22π1(4dδ)1. The 3Φ←a1Δ two-photon transitions were found to derive their intensities from spin–orbit and spin-uncoupling interactions in the 1Φ3, 3Φ4, 3Φ3, and 3Φ2 upper states. Analysis of the rotationally resolved bands, using a model which includes these factors, allowed the spin–orbit constant, aπ, for the 2π valence orbital to be derived as (159.0±1.0) cm−1. Rotationally resolved envelopes recorded for the (3dδ)1Φ, v'=0, 1←a1Δ, v‘=0 and (3pπ)1Σ+, v'=0←a1Δ, v‘=0 (2+1) NF MPI bands, could be simulated reasonably well assuming a Boltzmann rotational distribution for the a 1Δ state at ≈180 K. Experiments showed, however, that this was not a true measure of the initial state distribution because of predissociation or perturbation effects in the resonant intermediate state. Assignments for other two-photon resonant NF MPI bands observed in this work are also suggested. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.468884
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  • 3
    Electronic Resource
    Electronic Resource
    A 36 cm2 large monolythic pn-charge coupled device x-ray detector for the European XMM satellite mission (1997)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 68 (1997), S. 4271-4274 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: Monolythic arrays of 12 pn-charge coupled devices 3×1 cm2 each, have been developed and produced for the focal plane instrumentation of the high throughput European Photon Imaging Camera on XMM and the German ABRIXAS x-ray satellite mission. The design parameters have been optimized to match the properties of the x-ray imaging optics as well as the x-ray intensity, energy bandwidth, and characteristic time constants of objects to be observed. The pixel size is 150×150 μm2; read-out is performed in parallel with 64 channels in each subunit, resulting in a total of 768 channels; low noise, spectroscopic performance is realized by on-chip integrated JFET electronics; high ohmic, ultrapure bulk material allows full depletion and enhances the efficiency for higher energy x-ray detection. The fabrication process, the layout topology, and the operating conditions guarantee ten years operation in space without performance degradation. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1148341
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  • 4
    Electronic Resource
    Electronic Resource
    Vibrational excitation and quenching of N+2 in collision with He at relative energies below 1 eV (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 213-219 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A selected ion flow drift tube (SIFDT) has been used to measure the vibrational excitation of N+2 ions in collisions with He from the detected threshold to about 0.8 eV relative collision energy. The vibrational quenching of N+2 by He has been measured over the same energy range. The measured excitation and quenching rate constants are found to satisfy the principle of detailed balance, implying no significant role for rotational excitation in the excitation or quenching processes. The quenching rate constant fits a linear Landau–Teller plot, −ln KqαKE−1/3cm, in spite of the fact that the collisions at all energies studied are well within the low energy adiabatic regime in which the collision time is long compared to h/ΔEv.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454639
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  • 5
    Electronic Resource
    Electronic Resource
    Energy dependences of reactions between some atomic ions and SF6, and reevaluation of appearance potentials (SF+5/SF6) and D(SF5–F) (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 87 (1987), S. 4615-4618 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The reactions of Ar+, N+, and Kr+ with SF6 have been investigated using a selected ion flow drift tube in the energy regime from thermal to a few eV relative kinetic energy of the reactants, KEcm, and the reaction of Xe+ with SF6 from 2 to 5 eV, KEcm, SF+5 is the dominant ionic product in all cases with the exception of the endoergic Xe+ reaction, where SF+3 was observed to be the product ion, the rate coefficient increasing dramatically with KEcm. The reaction involving Ar+ and N+ are fast (k∼10−9 cm3 s−1) and vary only slightly with energy. In the case of Kr+ the 2P3/2 state reacts fast (k∼6×10−10 cm3 s−1), while the 2P1/2 state is about an order of magnitude less reactive. The finding of the Kr+ (2P3/2) reaction leads to values AP (SF+5/SF6) ≤14.0 eV and D(SF5–F)=3.83±0.1 eV.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.452873
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  • 6
    Electronic Resource
    Electronic Resource
    Competition between binary ion molecule reactions and ternary association reactions of CH+3 with NH3 in He buffer gas in the pressure range 0.2–1.7 Torr (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 87 (1987), S. 2105-2111 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The binary reaction of CH+3 with NH3 as well as their ternary association have been investigated in the regime from 0.047 to 0.2 eV, KEcm, using the Innsbruck selected ion drift tube (SIDT). In this energy regime the association rate coefficient declines from 4×10−26 to 6×10−27 cm6 s−1 and the lifetimes of the collision complex (CH+3−NH3)* range from ∼10−7 to ∼10−8 s.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.453185
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  • 7
    Electronic Resource
    Electronic Resource
    Resonance enhanced multiphoton ionization spectroscopy of the NF molecule: 1Σ+ and 1Δ 3p Rydberg states (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 6360-6368 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Two Rydberg states of the NF molecule, the 2 1Δ and 2 1Σ+ states, have been investigated by multiphoton ionization (MPI) spectroscopy. These states are observed via the two-photon resonance enhancements they provide in the multiphoton ionization spectra of NF a 1Δ and NF b 1Σ+. Both states are assigned on the basis of experimental evidence as Rydberg states with the dominant configuration ...1π45σ22π1 (3pπ)1. Ab initio calculations performed at the multireference determinant configuration interaction (MRDCI) level showed that these states were of mixed Rydberg-valence character with the Rydberg character [... 1π45σ22π1 (3pπ)1] dominating at short bond lengths (〈1.35 A(ring)) and the valence character (... 1π35σ22π3) becoming more important at longer bond lengths ((approximately-greater-than)1.35 A(ring)). These calculations also proved useful in providing a mechanism to account for the rotational predissociation observed in the experimental spectra.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.465874
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  • 8
    Electronic Resource
    Electronic Resource
    Vibrational quenching of NO+(v) in collisions with CH4 from 0.04 to 1.2 eV (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 89 (1988), S. 5692-5694 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The vibrational relaxation of NO+(v=1) ions in collisions with CH4 molecules has been measured in a flow drift tube experiment from thermal energy to 1.2 eV relative kinetic energy. The quenching rate constant has a broad minimum as a function of collision energy in the ∼0.5–0.6 eV range. These results are interpreted in terms of complex formation at low energies (KEcm (very-much-less-than)U) followed by vibrational predissociation in the complex and by a Landau–Teller nonadiabatic energy transfer at large relative kinetic energies (KEcm (very-much-greater-than)U), where U is the interaction well depth.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.455578
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  • 9
    Electronic Resource
    Electronic Resource
    Mobilities of Hg++(1S) and Hg++(3D) ions in helium (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 8632-8633 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.460051
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  • 10
    Electronic Resource
    Electronic Resource
    Erratum: Vibrational excitation and quenching of N+2 in collision with He at relative energies below 1 eV [J. Chem. Phys. 88, 213 (1988)] (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 4426-4427 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.457675
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