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  • 1990-1994  (7)
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Material
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Crossed-beam study of the reaction of van der Waals molecule H+(NO)2 (1990)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 92 (1990), S. 1657-1660 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Chemiluminescent reaction H+(NO)2 →HNO*+NO was studied under single collision condition. The built-in third body much enhanced the formation of HNO*(A 1A‘) in bimolecular relatively large population in bending vibration (ν3 ) as compared with the HNO* produced from the termolecular recombination, H+NO+M. This apparent excitation in bending mode can be attributed to the smaller internal energy of HNO* produced in H+(NO)2 reaction. Higher rotational states of the (001) vibration, if formed in H+NO+M reaction, most probably suffer rapid losses to X 1A' state by internal conversion. The lower energy content of HNO* formed in H+(NO)2 reaction suppresses this internal conversion and hence the relative population of the (001) state becomes large. The reaction probability was also measured as a function of collision energy and the result indicates the absence of the reaction barrier.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.458100
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Microscopic solvation of acetone to 9,9'-bianthryl studied in a free jet: Polar excited state formation (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 3496-3503 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Dynamics of the electronically excited state of 9,9'-bianthryl (BA)–acetone complexes was studied in a free jet. The BA–acetone complexes were produced by supersonic expansion of BA/acetone/He mixtures. The laser induced fluorescence spectrum of the BA–acetone complexes showed several bands which were ascribed to the complexes containing different number of acetone molecules. The number of acetone molecules attaching to BA was determined by mass-selected resonance-enhanced multiphoton ionization (REMPI) spectra for each band. The Stokes shift and lifetime were measured for each band, i.e., for the BA–acetone complex with a specific number of "solvent'' molecules. These measurements revealed that there are two kinds of BA–acetone complexes; one giving the broad laser-induced fluorescence (LIF) spectrum and largely redshifted fluorescence, and the other yielding the structured LIF and the sharp fluorescence spectrum similar to that of bare BA. The Stokes shift and the lifetime of the former complex increased with increasing number of solvated acetone molecules, whereas those of the latter complex are insensitive to the degree of solvation. These findings can be explained in terms of the importance of both the "symmetry breaking'' and the "polar microscopic solvation'' in forming the so-called twisted intramolecular charge–transfer state.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.459770
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Symmetry demand in polar excited state formation of 9,9'-bianthryl in clusters with some ketones (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 101 (1994), S. 1752-1754 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Laser-induced fluorescence (LIF) and dispersed fluorescence (DF) spectra have been studied for clusters of 9,9'-bianthryl (BA) with acetone, diethyl ketone, and methyl–ethyl ketone. Two different kinds of clusters have been observed in clusters containing the symmetric ketones. One shows broad LIF and DF spectra which are characteristic to the polar excited state of BA. The other shows sharp LIF bands and short lifetime which indicate the absence of the electron transfer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.467734
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of Pressure on the Conformational Behavior of 4-[4-(Dimethylamino)phenyl]pyridine in the Ground and Fluorescent S1-Excited States (1994)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 98 (1994), S. 2278-2281 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100060a011
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Photolysis of phenylsilane at 193 nm: energy distributions of the fragments (1994)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 98 (1994), S. 122-125 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100052a021
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Solute-solvent interaction in nonpolar supercritical fluid: a clustering model and size distribution (1990)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 94 (1990), S. 6420-6425 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100379a048
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    A spectroscopic and theoretical analysis of the internal rotation bands appearing in the S1–S0 transition of phenylsilane (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 800-809 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The laser-induced fluorescence excitation spectra of phenylsilane near the 0–0 transition have been observed and analyzed in terms of the torsional (internal rotational) motion of the silyl group. The rotational constants of phenylsilane in the excited state were also determined. The high-resolution spectrum of the 0–0 band shows a unique profile, which consists of an ordinary b-type profile and a central peak. The rotational contour analysis showed that the band consists of two overlapping torsional bands of a b-type transition. From the analysis including the rotational structure of the torsional bands, the potential barrier was determined to be 45.0 cm−1, which is much higher than that of toluene (27.0 cm−1). The large difference in the barrier height between toluene and phenylsilane reflects a difference in the electronically excited states of these compounds. An ab initio molecular orbital calculation was carried out to get an insight into the nature of the electronically excited phenylsilane. The calculated structures in both the S1 and S0 states are in good agreement with the observed ones. The interaction between the silyl group and the π system turned out to be due to hyperconjugation with the Si–H antibonding orbital, and the interaction with vacant d-orbitals of the Si atom is not significant.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.465343
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    Paper (German National Licenses)
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