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  • 1
    Electronic Resource
    Electronic Resource
    Binary Metal Metallocarbohedrenes of Titanium and Group IIIA, VA, and VIA Metals (1994)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 116 (1994), S. 5295-5297 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00091a038
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Photodissociation of Kr+n clusters (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 93 (1990), S. 3215-3223 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The photodissociation of Kr+n (3≤n≤11) cluster ions is observed for the first time in the 565 to 630 nm wavelength range. Kr+3 has a photodissociation cross section of (8.1±0.8)×10−17 cm2 at 612 nm, while Kr+4 and Kr+5 are found to have larger photodissociation cross sections than Kr+3 with a slightly red-shifted spectrum. Only Kr+ is detected as a photofragment of Kr+3, while in the Kr+n (4≤n≤7) experiments, both Kr+2 and Kr+ photofragments are seen. As size n increases from 7 to 11, Kr+ disappears and Kr+3 appears. Laser power studies show that all are single photon photodissociation processes. For higher order Kr+n clusters (4≤n≤7) the intensity ratio between the two photodissociation products Kr+2 and Kr+ is dependent on the wavelength of the laser light used in the photodissociation, but independent of the polarization direction of the laser. Translational energy analysis of the photofragments is used to investigate the photodissociation mechanisms. In contrast to the photodissociation of Kr+3, where two types of Kr+ photofragments with different values of translational energy release are observed, only one type of Kr+2 photofragment, with zero kinetic energy release is found in the Kr+4 photodissociation. These findings are discussed in terms of the dynamics of photodissociation and possible structures of these cluster ions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458854
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  • 3
    Electronic Resource
    Electronic Resource
    TixZryC12 and TixHfyC12 (x+y=8): Binary metal metallocarbohedrenes (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 100 (1994), S. 5384-5386 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We report the production of binary metal metallocarbohedrenes. Direct laser vaporization of mixtures of zirconium or hafnium powders with titanium carbide yield the species TixZryC12 and TixHfyC12 (x+y=8). These results are discussed in the context of recent theoretical models addressing the stabilities and structures of the metallocarbohedrenes, their formation mechanism and possible implications for the synthesis of "doped'' metallocarbohedrenes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.467154
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  • 4
    Electronic Resource
    Electronic Resource
    Photodissociation of binary metal metallocarbohedrenes (1997)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 106 (1997), S. 2231-2238 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The 532 nm photodissociation of the three singly substituted, binary metal containing Metallocarbohedrenes, Ti7MC12+ (M=Y, Zr, or Nb), is investigated. The photofragments are identified through energy analysis of the fragment ions in a reflectron time-of-flight mass spectrometer, a new technique in photodissociation studies that results in a more accurate identification of the photofragment mass than what would normally be achievable through mass analysis using time-of-flight determinations. The findings reveal that the dominant mechanism proceeds through the loss of neutral Ti atoms for all clusters studied. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.474118
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  • 5
    Electronic Resource
    Electronic Resource
    The delayed ionization and atomic ion emission of binary metal metallocarbohedrenes TixMyC12 (M=Zr, Nb; 0≤y≤4; x+y=8) (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 104 (1996), S. 3423-3432 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Investigations of the photophysical character of binary metal containing metallocarbohedrene clusters (Met-Cars), reveal the phenomena of delayed ionization. Additionally, the onset of a channel corresponding to delayed atomic ion emission is observed at high laser fluence, becoming progressively more significant as the fluence is raised. The fluence dependence of both the delayed electron and delayed atomic ion emission channels at 355 and 532 nm are reported, and the Met-Car delayed ion yield estimated. At moderate fluences, the yield of the delayed electron emission channel leading to the Met-Car ion is found to be on the order of 70% of the total Met-Car signal. All of the experimental findings point to thermionic emission being the operative mechanism for the delayed ionization, while the delayed atomic ion emission is evidently a new mechanism [B. D. May, S. F. Cartier, and A. W. Castleman, Jr., Chem. Phys. Lett. 242, 265 (1995)] which may be due to the collective electronic excitation of these cluster materials. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.471535
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  • 6
    Electronic Resource
    Electronic Resource
    Ab initio potential energy surface for Ar 3 + (1993)
    Springer
    The European physical journal 25 (1993), S. 239-246 
    Details
    ISSN: 1434-6079
    Keywords: 31.20.Di ; 33.80.Gj ; 36.40.+d
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The potential energy surface (PES) of linear Ar 3 + is calculated at the MP4/6-31G* level including all single, double, triple and quadruple excitations. The results show that the PES of the linear Ar 3 + has a very flat valley along the asymmetric stretching vibration normal mode, ν3. A higher level quadratic configuration interaction calculation including single, double and triple substitutions QCISD (T) along this flat valley suggests that an asymmetric geometry energy minimum reported earlier based on MP2 [1] is due to symmetry breaking in UHF. The global minimum of the PES is found to be for the symmetric geometry atR ab =R bc =2.66±0.01 Å, which is in good agreement with the MRD-CI calculation [2] and expectations from our earlier photodissociation experiments [3]. The calculational results are compared with other theoretical calculations, and are discussed in the context of the photodissociation and dynamics of dissociation experiments conducted on Ar 3 + .
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01426886
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