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  • 1
    Electronic Resource
    Electronic Resource
    Solvation of Transition Metal Ions by Water. Sequential Binding Energies of M+(H2O)x (x = 1-4) for M = Ti to Cu Determined by Collision-Induced Dissociation (1994)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 116 (1994), S. 3519-3528 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00087a044
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  • 2
    Electronic Resource
    Electronic Resource
    Stepwise solvation enthalpies of protonated water clusters: collision-induced dissociation as an alternative to equilibrium studies (1993)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 115 (1993), S. 12125-12131 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00078a059
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  • 3
    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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  • 4
    Electronic Resource
    Electronic Resource
    Benzonitrile and its van der Waals complexes studied in a free jet. I. The LIF spectra and the structure (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 1111-1117 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The van der Waals (vdW) complexes consisting of benzonitrile and various partner species were formed in a free jet and their laser-induced fluorescence (LIF) spectra were recorded. For all the species chosen as partners (Ar, Kr, N2O, CF3H, and H2O), the LIF spectra showed a red shift relative to that of benzonitrile monomer. The spectral shift increased with increasing dipole moment of the partner species owing to the large dipole–dipole interaction between the partner species and benzonitrile whose dipole moment amounts to 4.14 D. With the aid of computer simulation, the rotational contours of the LIF spectra of the benzonitrile dimer and benzonitrile–Ar complex were analyzed. The dimer was found to be in planar form with the two CN groups facing each other in an antiparallel geometry, whereas in the Ar complex the Ar atom lies over the benzene ring slightly leaning toward the CN group.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.452252
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  • 5
    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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  • 6
    Electronic Resource
    Electronic Resource
    Laser-initiated half-reaction. Vibrational and rotational state distribution of NO produced from the reactant pair O(1D)⋅N2O (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 4739-4747 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The vibrational and rotational state distribution was measured for NO produced from the reaction O(1D)+N2O→2NO via a reactant pair O(1D)⋅N2O, which, in turn, formed by the 193 nm photolysis of the N2O dimer. The dimer was generated by the supersonic expansion through a pulsed nozzle. The distribution was determined by using the laser-induced fluorescence of NO on its A–X transition. The rotational distribution was of the Boltzmann type characterized by a low temperature, 60–100 K, at each vibrational level measured. The vibrational distribution was found to be composed of the two components, one very cold and the other relatively hot. The experiment using an isotopically labeled N2O revealed that the vibrational energy was not equally distributed over two kinds of NO; the NO originally present in N2O was vibrationally cool while that formed from O(1D) and the terminal nitrogen of N2O was vibrationally hot. These results indicate that the reaction occurring is the abstraction of the terminal nitrogen by O(1D). The low rotational temperature, which sharply contrasts with the extremely high rotational excitation observed for the ordinary bimolecular reaction, can be rationalized by considering the geometrical difference in the encounter between the O(1D) atom and N2O. This fact, in turn, indicates that the product energy distribution is significantly affected by the orientation in the reactive encounter.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454687
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  • 7
    Electronic Resource
    Electronic Resource
    State selected ion–molecule reactions by the TESICO technique. XIII. Vibrational state dependence of the cross sections in the reaction C2D+2(ν2)+H2 (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 688-692 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Vibrational-state selected reaction cross sections have been measured for three product channels of the reaction C2D+2(ν2)+H2, by use of the threshold electron–secondary ion coincidence (TESICO) technique. The ν2 vibrational states of the C2D+2 ion were selected up to v=2 and the collision energies were changed from 0.1 to 2.0 eV. At low collision energies up to 0.2 eV, considerable enhancement of the cross sections for the channel producing C2D2H+ was observed when the vibrational quantum number was increased successively. As the collision energy was increased, the extent of this enhancement diminished gradually and the cross section became almost independent of v at 2.0 eV. The cross section for the H/D exchange channel, on the other hand, was found to decrease with increasing vibrational quantum number at low collision energies. The latter cross section also became independent of v at high collision energies. These results have been explained in terms of the formation of an intermediate complex and the statistical decomposition of this complex to products.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.452271
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  • 8
    Electronic Resource
    Electronic Resource
    Crossed beam study of the reaction of van der Waals molecule O+(NO)2→NO*2+NO (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 86 (1987), S. 5491-5499 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The reaction O+(NO)2 was studied by use of a crossed-beam apparatus. An (NO)2 beam generated by the supersonic expansion crossed at right angles with a collimated effusive beam containing oxygen atoms which were formed by microwave discharge. The product NO@B|2 was detected by the chemiluminescence. The angular distribution of the product was measured by an angle-resolved emission detection technique. The distribution has forward and backward peaks with respect to the oxygen atom incidence and indicates the occurrence of an intermediate complex in the course of the reaction. The angular velocity distribution, as well as the onset of the chemiluminescence, indicates that the reaction exothermicity appears mostly as internal energy of NO*2 . The remaining energy flows into the product translation and rotation; the vibrational freedom of the third-body molecule is not effective as an energy absorber. The emission intensity was found to decrease with increasing relative collision energy. A sharp drop of the intensity was observed at 2 kcal/mol of collision energy, which is in good agreement with the bond energy of the NO dimer.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.452521
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  • 9
    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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  • 10
    Electronic Resource
    Electronic Resource
    Laser initiated half reaction study of H+O2→OH+O (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 102 (1995), S. 7856-7863 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The H+O2 reaction system was studied under geometry limited half reaction conditions. The weakly bonded complex O2–H2S was formed by supersonic expansion, and reaction was initiated by 193 nm photoirradiation of the complex. Rotational, spin-orbit, and lambda doublet state distributions of product OH were determined by a laser-induced fluorescence (LIF) technique. The populations of the two spin-orbit states were observed to be statistical. The population of the Π(A') level was almost twice that of the Π(A‘) level, and the planar geometry was suggested for reaction path. These populations of the fine structures of OH were similar to those of OH formed under bimolecular reaction conditions. On the other hand, the rotational state distribution of OH from the half reaction has two components and the dominant one shows a very cold rotational distribution, in sharp contrast with that of the bimolecular reaction where rotation is highly excited. This cold rotational distribution could be partially explained by the absorption of a part of available energy by the internal motion of SH. However, the distribution with a peak at the lowest rotational level could not be explained by this effect, but ascribed to the exit interaction between SH and OH and/or the entrance channel specificity, i.e., the reaction occurs in limited impact parameters. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.468986
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