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  • 1
    Electronic Resource
    Electronic Resource
    The rotationally resolved infrared spectrum of the ν1 stretch of the allyl radical (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 109 (1998), S. 7803-7809 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Transient infrared (IR) laser spectroscopy near 3100 cm−1 was used to observe the ν1 and ν13 transitions of the allyl radical, with their band origins found to lie at 3113.9779(3) cm−1 and near 3110.5 cm−1, respectively. Detailed assignment and analysis of the ν1 transition identified over 1100 transitions, and yielded improved values for ΔK and ΦK ground state centrifugal distortion constants, as well as a new set of excited state (ν1=1) rotational and centrifugal distortion constants, in addition to determining the band origin. Transitions involving states with quantum number up to Ka=11 and N=27 were identified. Strong perturbations were found in the excited state, included global perturbations of the Ka′=3 branch, extensive perturbations in the Ka′=2 and 4 branches, and very localized perturbations in the Ka′=6 branch. The Ka′=9 and 10 branches also appear to be significantly perturbed. Possible sources for these perturbations are discussed. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.477426
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  • 2
    Electronic Resource
    Electronic Resource
    Rate Constant Measurement of the Recombination Reaction C3H3 + C3H3 (1994)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 98 (1994), S. 7029-7035 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100079a023
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  • 3
    Electronic Resource
    Electronic Resource
    ν1 and ν1+ν5 of DCCN: Determination of the ν5 energy and the quasilinearity of DCCN (1998)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 109 (1998), S. 8851-8856 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The high resolution infrared spectrum of DCCN in the region of 2385–2530 cm−1 has been investigated using infrared kinetic spectroscopy. The CD stretching fundamental, ν1,together with the closely related hot bands, ν1+ν5−ν5,ν1+2ν5±2−2ν5±2, and ν1+2ν50−2ν50 have been observed and assigned. In addition the combination band, ν1+ν5, was observed. When the information provided by this perpendicular band is combined with that provided by ν1+ν5−ν5, the vibrational energy of ν5 is accurately determined to be 74.845(2) cm−1. This measurement, when combined with the ab initio and semirigid bender calculations of Malmquist et al., gives a barrier to linearity of 280 cm−1. Generally, fine structure splittings are not resolved for any levels except those belonging to the upper l- or K-type doubling components of ν1+ν5. This fine structure splitting is most strongly exhibited in the Q-branch of the ν1+ν5 band where it is 0.039 cm−1. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.477556
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  • 4
    Electronic Resource
    Electronic Resource
    Volumetric and Thermodynamic Properties of Fluids—Enthalpy, Free Energy, and Entropy (1958)
    s.l. : American Chemical Society
    Industrial & engineering chemistry 50 (1958), S. 265-274 
    Details
    ISSN: 1520-5045
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ie50578a047
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  • 5
    Electronic Resource
    Electronic Resource
    Photophysics of buckminsterfullerene and other carbon cluster ions (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 220-230 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The laser-induced fragmentation behavior of positive carbon cluster ions has been investigated by tandem time-of-flight techniques for the jet-cooled clusters up to 80 atoms in size. Two distinct photophysical regimes were found. The first applies to clusters with 34 atoms or more, all of which dissociate to produce even numbered fragments. Large even clusters fragment by the loss of the high energy species C2, odd ones lose a C atom. The second regime applies to clusters composed of 31 or less atoms, all of which fragment by the loss of C3. These two regimes are sharply separated by C+32 which fragments to produce small cluster ions in the 10–19 atom size range. Fragmentation of the large clusters occurs on a microsecond or faster time scale only at very high levels of excitation (〉12.8 eV). These photophysical results are interpreted as consequences of the large even clusters having edgeless, spheroidal cage structures while the small ones have linear chain or ring structures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454640
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  • 6
    Electronic Resource
    Electronic Resource
    Photodissociation of semiconductor positive cluster ions (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 1670-1677 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Laser photofragmentation of Si, Ge, and GaAs positive cluster ions prepared by laser vaporization and supersonic beam expansion has been investigated using tandem time-of-flight mass spectrometry. Si clusters up to size 80, Ge clusters to size 40, and GaAs clusters up to a total of 31 atoms were studied. Si+n and Ge+n for n=12–26 give daughter ions of about half their original size. For both Si and Ge, this apparent positive ion fissioning appears to go over with increasing n to neutral loss of seven and ten, but for Si+n the range of n values where this is observed is rather small. At low fluences, the larger Ge+n clusters up to the maximum size observed (50) sequentially lose Ge10 (and in some cases with lower intensity Ge7). Larger Si+n clusters (n〉30) always fragment primarily to produce positive ion clusters in the 6–11 size range with a subsidiary channel of loss of a single Si atom. At high laser fluences, Ge+n also fragments to produce primarily positive ion clusters in the 6–11 size range with an intensity pattern essentially identical to Si+n at similar fluences. GaxAs+y clusters lose one or more atoms in what is probably a sequential process with positive ion clusters in which the total number of atoms, x+y, is odd being more prominent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454145
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  • 7
    Electronic Resource
    Electronic Resource
    Color center laser spectroscopy of vibrationally excited C2H (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 1657-1661 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Infrared transitions involving vibrationally excited C2H radicals produced by excimer laser (193 nm) flash photolysis of acetylene were observed in transient absorption by color center laser probing. Three bands with origins at 3702, 3562, and 3320 cm−1 were found, assigned, and analyzed. All three bands are of 2∑–2∑ symmetry with the lower state of each transition the vibrationally excited (0,0,1) level of the ground electronic state. The frequencies and fitted spectroscopic constants for the three bands are reported. Possible vibronic assignments of the upper states are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.452163
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  • 8
    Electronic Resource
    Electronic Resource
    Photoexcitation of reaction complexes in the reaction K+NaCl→KCl+Na (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 85 (1986), S. 844-855 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Emission at the Na D lines has been observed from the intersection of crossed molecular beams of K and NaCl irradiated by a cw dye laser at wavelengths from 590 and 735 nm. The three-beam signal exhibits a threshold near 735 nm and is linearly dependent on the laser and molecular beam intensities. This three-beam signal has been observed under experimental conditions in which all two-beam signals are accounted for, and is attributed to the formation of Na* by photoexcitation of the KNaCl reaction complex. The effective two-body cross section for the process is approximately 10−21 cm2 in a laser field of 1.5 kW/cm2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.451292
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  • 9
    Electronic Resource
    Electronic Resource
    Photodetachment and photofragmentation studies of semiconductor cluster anions (1986)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 85 (1986), S. 7434-7441 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Silicon, germanium, and gallium arsenide negative cluster ions are produced by laser vaporization followed by free supersonic expansion. Electron affinities (EA) of the corresponding neutral clusters are roughly bracketed by measuring the fluence dependence for photodetachment from anions at discrete probe laser wavelengths (above the photodetachment threshold the dependence on fluence is linear, below it is quadratic). An even/odd alternation is found in the negative ion distribution with gallium arsenide clusters with an odd number of atoms having higher EA's than their even neighbors. This suggests that the surfaces of the even clusters are extensively restructured in a way which eliminates dangling chemical bonds. For GaxAsy with x+y constant, EA increases with increasing ratio of y to x. The EA of silicon increases smoothly with cluster size extrapolating towards the EA of bulk silicon. Photofragmentation studies show that, like the corresponding positive ions, silicon and germanium negative ions with 11 to 23 atoms fission into mainly 5 to 10 atom negative ions. Si−10 and Ge−10 are the favorite daughters suggesting the existence of a special structure for ten atoms.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.451332
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  • 10
    Electronic Resource
    Electronic Resource
    Rotational analysis of the A˜ ← X˜ system of C2Hf a@f ) (1985)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 82 (1985), S. 3479-3486 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Precise frequencies for the observed lines of five bands of the A˜ 2Π ← X˜ 2Σ system of C2H are reported. These frequencies have been least-squares fitted with an effective rotational Hamiltonian and the resulting parameters are given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.448927
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