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  • 1
    Electronic Resource
    Electronic Resource
    Temperature dependence of electron transmission through organized organic thin films (2000)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 113 (2000), S. 7571-7577 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The temperature dependence of electron transmission through various organized organic thin films (OOTFs) was investigated. For most systems a strong dependence of the transmission efficiency on temperature was observed, even for a relatively small temperature range. The well defined structure of the OOTFs and the monitoring of the angular dependence of both the initial and the final velocities of photoelectrons were used to reveal the mechanism behind the temperature effect and further elucidate the transmission mechanism. A simple model, which assumes that the electron transmission yield is much higher along the organic chains than in any other direction, was able to reproduce the experimental observations. We find that the photoelectron transmission yield through OOTFs is extremely sensitive to the structural order in the film. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1313238
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  • 2
    Electronic Resource
    Electronic Resource
    Dipole moment of nonrigid molecular systems: The dipole moment of hydrochloric dimers (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 110 (1999), S. 359-362 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: In recent experiments on HCl dimers, three surprising observations were found. A "dipole moment" was measured in Stark-shift-related experiments despite the spectroscopic indication of fast tunneling motion. The measured dipole moment varied with the state probed, and the apparent first-order Stark effect was observed only in the case of the heterodimer H35Cl–H37Cl but not for the homodimers (H35Cl)2 or (H37Cl)2. We present physical arguments which explain all the observations and indicate that the spectroscopy has to be reinterpreted and that the isotope effect in the tunneling motion can not be inferred simply from the spectroscopy. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.478132
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  • 3
    Electronic Resource
    Electronic Resource
    An electron multiplier capable of working at low vacuum: The microsphere plate (1996)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 67 (1996), S. 3332-3333 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A new type of electron multiplier that has recently been developed, the microsphere plate (MSP), does not have the problem of ion feedback, which limits the operation of the known microchannel plates. Due to its structure, the MSP can amplify charge current even at pressures as high as 0.1 mbar. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1147416
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  • 4
    Electronic Resource
    Electronic Resource
    Multiphoton ionization study of intra- and intermolecular effects on the photodissociation of methyl iodide (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 3638-3645 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A time-of-flight mass spectrometer (TOFMS) was used to obtain multiphoton ionization (MPI) mass and wavelength spectra of methyl iodide. The sample was studied in a molecular jet environment which allowed preparation of isolated molecules and/or clusters of different size. Excitation was performed to access the dissociative valence A state and the predissociative Rydberg C state. Valence state excitation produced no TOF ion signal for (CH3 I)n, n=1, but produced I+2 for n=2 and CH3 I+ for large n. The presence of CH3 I+ is an indication of cluster "caging'' of the chromophore and consequential stabilization of the valence state by intermolecular interactions. REMPI spectra of the Rydberg C state origin and C–I stretch produced results that reflect the longer lifetime of this intermediate state. Spectral line shapes and intensities, and mass fragmentation patterns are discussed in light of the photodissociation dynamics of the intermediate Rydberg state and the effect of intermolecular interactions on this process.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.453863
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  • 5
    Electronic Resource
    Electronic Resource
    Ultraviolet absorption spectroscopy of dissociating molecules: Effects of cluster formation on the photodissociation of CH3I (1987)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 87 (1987), S. 2522-2530 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The ultraviolet absorption spectra of jet-cooled CH3I, (CH3I)2, and (CH3I)n, n〉2 are measured in the valence A state and the Rydberg B state. A significant blue shift of the valence state is observed upon cluster formation. The magnitude of this shift yields a dimer bond strength of at least 500 cm−1 which implies extensive dimer formation at room temperature and moderate pressures. The methyl iodide B-state spectrum consists of a single progression in the ν2 mode. Dimerization retards the predissociation and therefore increases the excited state lifetime; consequently many new modes are observed which in the monomer are coupled to the dissociation. The implications of this result to the photodissociation dynamics are discussed. The Rydberg spectra of (CH3I)n, n〉2 show asymmetric line shapes which may be due to interferences between the B state and an underlying continuum. The nature of these interferences and the possible indentity of this continuum are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.453091
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  • 6
    Electronic Resource
    Electronic Resource
    On the apparent spectroscopic rigidity of floppy molecular systems (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 3801-3809 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: There has been a wealth of recent infrared experimental data on van der Waals and hydrogen bonded complexes obtained under cooled, supersonic jet conditions where only a small fraction of the total bound quantum states can be elucidated. This partial set of data can often be well fit to a traditional Watson Hamiltonian derived from a rigid rotor perspective with low order centrifugal distortion effects included. In this paper we show that even in extremely floppy molecular systems with wide amplitude vibrational motion, the quantum term values are very well fit by a rigid or semirigid rotor Hamiltonian over the limited range of energy states accessible in a cooled beam. We provide explicit examples of this behavior by full quantum solutions in two extremes of floppy motion: (1) a symmetric triatomic with a square well bending potential ("hinge'') and (2) a nearly free internal rotor ("pinwheel''). These results show that potentials with fundamentally different topologies can be consistent with same data, and indicate that even the limits of nearly rigid and floppy internal motion may be difficult to distinguish from a limited set of rovibrational eigenvalues.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456865
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  • 7
    Electronic Resource
    Electronic Resource
    Energy distribution in aniline scattered from various low energy surfaces (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 94 (1991), S. 4921-4927 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Aniline has been scattered from three organic substrates and a LiF single crystal surface. Applying multiphoton ionization and time of flight measurements the vibrational, rotational, and translational energy distributions were measured simultaneously. The NH2 "umbrella'' like mode was found to be a very efficient accepting mode in the energy transfer process. The less rigid the surface, the greater the efficiency with which this mode is populated. The mode specificity does not exist for the rigid LiF surface. A model is presented, which explains all observations based on the collision time and kinematics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.460577
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  • 8
    Electronic Resource
    Electronic Resource
    Vibrational induced photodetachment of electrons from small clusters (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 5198-5199 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456563
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  • 9
    Electronic Resource
    Electronic Resource
    Rotational and state-resolved translational distributions of NO scattered from organized amphiphilic monolayers (1988)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 88 (1988), S. 2757-2763 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Two-photon ionization has been used to probe NO scattered from two different long chain organic amphiphiles. Rotational and state-resolved translational distributions were obtained. The results show that there is a large difference in the dynamics of scattering from an unsubstituted aliphatic chain as compared to a monolayer in which the exposed end has been perfluorinated. NO scattered from the latter is more energetic both rotationally, and translationally. This effect becomes particularly noticeable as the incident energy of the NO is raised. The results can be explained by a mechanism which ignores the weak NO–surface potential and treats only the differences in rigidity and phonon modes in the two monolayers.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.454006
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  • 10
    Electronic Resource
    Electronic Resource
    Thermally induced disorder in organized organic monolayers on solid substrates (1986)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 90 (1986), S. 3054-3056 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100405a004
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