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  • 1
    Electronic Resource
    Electronic Resource
    Single vibronic level relaxation in photoreactive 9-tert-butylanthracene (1992)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 96 (1992), S. 10666-10671 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100205a018
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  • 2
    Electronic Resource
    Electronic Resource
    Photodissociative excitation processes of XeF2 in the vacuum ultraviolet region 105–180 nm (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 102 (1995), S. 5966-5978 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Photodissociative excitation processes of XeF2 are studied by absorption and photofragment fluorescence spectroscopies in the vacuum UV region 105–180 nm. The quantum yields are measured along with the dispersed fluorescence spectra for emissions from XeF* (B, C, and D) excimers formed from XeF2 excited by linearly polarized, monochromatized synchrotron radiation. Fluorescence anisotropy, R, of XeF* fragment emission was also measured against excitation light wavelength in the region 105–165 nm. The quantum yields for XeF* excimer formation are found to be very high; especially in the valence band region shorter than 130 nm it reaches almost unity. From the fluorescence measurements we have observed new peaks assigned to 5πu→5dR Rydberg transitions. The intense 5πu3/2→6sR bands which appear around 143 nm exhibit no fluorescence excitation bands; even fluorescence dips are observed at 143.18 and 144.25 nm whereas very weak positive fluorescence bands are observed at 141.04 and 142.11 nm. The R values for the very broad valence bands which underlie intense Rydberg bands are found to be high. The 5πu series of Rydberg bands exhibit low R values. Based on the energetics and the results of quantum yields and fluorescence anisotropy values, the valence and Rydberg bands observed are assigned from the viewpoint of symmetry of the excited state, and the dynamics of the dissociation processes is discussed. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.469331
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  • 3
    Electronic Resource
    Electronic Resource
    Modification of a high vacuum, crossed molecular beam scattering system to perform angle-resolved, gas-surface scattering studies under ultrahigh vacuum conditions (1999)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 70 (1999), S. 1806-1815 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A molecular beam apparatus which was formerly used for crossed molecular beam chemiluminescence experiments under high vacuum conditions has been modified into an ultrahigh vacuum apparatus with a rotatable mass spectrometer detector equipped with an electron bombardment ionizer to study (1) the molecule-surface scattering process, (2) molecular beam-surface reaction dynamics, and (3) light-excited molecular desorption. Every flange surface originally sealed using a Viton o ring is sealed with a combination of an inner spring-loaded Teflon or aluminum seal with an outer Viton o ring, the intermediate region being pumped with a diffusion pump. Due to the limited space available for a rotatable detector chamber and to make the neutral flight length in time-of-flight (TOF) measurements as long as possible, the electron bombardment ionizer is installed at the farthest end of a triply differentially pumped detector chamber; thus, the ions formed are extracted toward the reverse direction of the scattered neutral molecular beam, mass selected with a quadrupole mass filter, and detected by an electron multiplier. Using this apparatus, angular and TOF distributions have been measured for Xe scattered from crystalline graphite surface and for the desorbed product, SiCl2, from the etching reaction of Si(111) with a beam of hyperthermal Cl2 molecules. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1149673
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  • 4
    Electronic Resource
    Electronic Resource
    Characterization of silica glasses sintered under Cl2 ambients (1991)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 69 (1991), S. 1849-1852 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Chlorine incorporated into silica glasses by sintering porous soot rods under Cl2/He atmosphere or by fabricating with plasma methods were found to be mostly as ≡SiCl, which gives rise to an optical absorption tail above (approximately-equal-to)7.5 eV. The cross section of the optical absorption at (approximately-equal-to)7.77 eV (160 nm) was found to be 1.14×1020 cm2. This value was almost the same as that of ≡SiCl in SiCl4 molecule in the gas phase. A minor fraction (10−3∼10−1) was found to be present as Cl2 molecule, which gives the absorption band at 3.8 eV.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.348753
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  • 5
    Electronic Resource
    Electronic Resource
    Far-infrared assignments for bridging cobalt-halogen stretching vibrations in several coordination compounds (1969)
    s.l. : American Chemical Society
    Inorganic chemistry 8 (1969), S. 1851-1855 
    Details
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ic50079a008
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  • 6
    Electronic Resource
    Electronic Resource
    Dissociative excitation of water by metastable rare gas atoms: Rg(3P0,2)+H2O→Rg+OH(A 2Σ+)+H (Rg=Ar,Kr) (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 835-844 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The title reactions were studied over the relative collision energy range 0.3–1.8 eV in crossed molecular beams. Vibrational and rotational state distributions of the nascent OH(A 2Σ+) product were determined by analysis of fluorescence from the OH(A 2Σ+–X 2Π) bands. The rotational distributions could be represented by simple Boltzmann distributions. With Ar*(3P0,2) excitation, both vibrational and rotational distributions were found to have no significant dependence on the collision energy and compare well with results previously obtained at near-thermal energies. With Kr(3P0,2) excitation, however, the state distributions were found to be strongly collision-energy dependent, the rotational temperature Tr (v=0) increasing from 850 to 1750 K and the vibrational population ratio Nv=1/Nv=0 from ≤0.09 to 0.14 as the collision energy was increased from 0.35 to 0.65 eV. Time-of-flight (TOF) energy selection was used to measure the integral cross sections for the formation of the OH(A). The collision energy dependence of the cross section for the reaction Ar(3P0,2) +H2O→Ar+OH(A 2Σ+)+H was found to be negative, whereas that for the reaction Kr(3P0,2)+H2O→Kr +OH(A 2Σ+)+H exhibited a positive dependence. To understand the above experimental findings, possible mechanisms for the formation of OH(A 2Σ+) from Rg(3P0,2)+H2O are considered that are consistent with the hypothesis that the reaction is governed by spin conservation. It is found that the present results clearly display the characteristic features of reaction dynamics that involve triplet excited potential surfaces. The formation of OH(A) is well interpreted as dissociation of an excited intermediate H2O*(d˜ 3A1) state produced competitively in the decay of triplet Rydberg states.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454163
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  • 7
    Electronic Resource
    Electronic Resource
    Deuterium isotope effect on the cross section for the dissociative excitation process: Ar(3P0,2)+CH3CN, CD3CN→Ar+CH3, CD3+CN(B 2Σ+) (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 87 (1987), S. 2404-2405 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.453127
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  • 8
    Electronic Resource
    Electronic Resource
    Collision energy dependence of the cross sections for the dissociative excitation reactions: Rg(3P0,2) +NH3→Rg+NH(A 3Π, c 1Π)+H2 (Rg=Ar, Kr) (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 84 (1986), S. 4930-4937 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The integral cross sections for the title reactions were determined for the relative collision energies between 0.3 and 1.4 eV by applying arc-heating metastable rare gas beams to a crossed molecular beam–time-of-flight (TOF) energy selection technique, in which product fluorescence intensities from both NH(A 3Π–X 3Σ−) and NH(c 1Π–a 1Δ) bands were monitored. With Ar(3P0,2 ) excitation, the relative branching fractions of nascent NH(A 3Π) and NH(c 1Π) formation were found to be invariant with the collision energy within the experimental error. With Kr(3P0,2) excitation, however, no apparent NH(c 1Π–a 1Δ) emission was observed, only emission from NH(A 3Π) was observed. The absolute cross section for formation of these nascent NH radicals was also determined. Collision energy dependence of the cross section for the reaction Ar (3P0,2) +NH3→Ar(1S0)+NH(A 3Π,c 1Π)+H2 was found to be negative, whereas that for the reaction Kr(3P0,2 )+NH3→Kr(1S0)+NH(A 3Π)+H2 showed positive dependence in the collision energy range studied. Possible mechanisms for the formation of NH(A 3Π,c 1Π) from Rg(3P0,2)+NH3 are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.449980
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  • 9
    Electronic Resource
    Electronic Resource
    Chemiluminescence of NS(B 2Π) produced by the reaction of N(2D, 2P) with COS and CS2 in crossed molecular beam (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 87 (1987), S. 7344-7345 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.453330
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  • 10
    Electronic Resource
    Electronic Resource
    CCl2(A˜ 1B1) radical formation in VUV photolyses of CCl4 and CBrCl3 (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 85 (1986), S. 5717-5722 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: In vacuum ultraviolet photolyses of CCl4 and CBrCl3 a diffuse emission band was observed in the region of 410–750 nm by Ar i resonance and H Lyman-α line irradiation. The band was attributed to a CCl2(A˜ 1B1 → X˜ 1A1) transition from the measurements of the appearance energies of the emitters produced from photodissociative excitation of both CCl4 and CBrCl3 using synchrotron radiation. The fluorescence decay of the CCl2(A˜ → X˜) transition showed a superposition of two lifetime components of 2.17±0.26 and 4.0±0.12 μs at pressures from 10 to 140 mTorr. The pressure dependence of the amplitudes for the two lifetimes suggests the occurrence of collision-induced intersystem crossing between 1B1 and 3B1 states of CCl2 radicals. The absorption cross section of CBrCl3 was measured for the first time in the 106–200 nm wavelength region and tentative assignments of Rydberg transitions are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.451532
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