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  • American Institute of Physics (AIP)  (5)
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  • 1
    Electronic Resource
    Electronic Resource
    Stimulated Raman adiabatic passage with pulsed lasers: High resolution ion dip spectroscopy of polyatomic molecules (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 100 (1994), S. 4784-4789 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The interaction of two narrow band (Δν〈100 MHz) UV light pulses of different intensity with a molecular three-level system is investigated experimentally. The laser frequencies are tuned to an up (pump) and a down (dump) transition sharing a common excited rovibronic S1 level whose population is probed by a transition to the ionization continuum and ion detection. The time sequence of the two pulses results either in a lambda type coherent stimulated Raman adiabatic passage or a stimulated emission pumping (SEP) process. When the first case is realized by a 6.4 ns delay of the low intensity pump laser from the high intensity dump laser pulse, a fourfold increase of the depth of the ion dips compared to the SEP experiment is observed. This is in line with numerical calculations of the level populations using a density matrix formalism including coherent effects. Rotationally resolved ion dip spectra of the 62 state of benzene are presented and demonstrate the high sensitivity of the coherent excitation process of this work for ion dip spectroscopy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.466269
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  • 2
    Electronic Resource
    Electronic Resource
    The van der Waals rovibronic spectrum of p-difluorobenzene–Ar up to 125 cm−1 intermolecular energy: Assignment and character of van der Waals modes (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 102 (1995), S. 3055-3063 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The van der Waals (vdW) vibronic spectrum built on the electronic 000, S1(B2)←S0(A1) origin of p-difluorobenzene–Ar is investigated with rotational resolution (ΔνUV=60 MHz). For the first time vdW vibronic bands are detected up to a van der Waals energy of 125 cm−1 and assigned by a rotational analysis of the band structure. The band origin positions of the ten detected bands display a regular behavior with moderate anharmonicities and minor influences due to Fermi resonances. Using the concept of three-dimensional Kraitchman equations and of normalized effective planar moments characteristic data on the nuclear displacements in the two different bending coordinates are deduced from the measured rotational constants. The fundamental vdW vibronic states at low energies can be described in terms of one-dimensional normal modes while vdW states at higher energies display mixed mode character. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.468615
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  • 3
    Electronic Resource
    Electronic Resource
    Microsolvation of aromatic molecules by argon: Structure of fluorene–(Ar)2 from high-resolution ultraviolet spectroscopy (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 101 (1994), S. 9257-9261 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: We present the high-resolution UV spectrum of the 000(S1←S0) transition in fluorene–(Ar)2 recorded by mass-selective resonance-enhanced two-photon ionization with a pulsed narrow-band laser system (Δν=140 MHz). The measured b-type rotational structure of the strongest band at 33 692.51 cm−1 in fluorene–(Ar)2 allows the exclusion of a (2||0) structure for this band with the two Ar atoms placed on one side of the substrate. The observation of a b-type rotational transition is proof of a specific opposite sided (1||1) structure with the two Ar atoms placed above (and below) the central five-membered ring and one remaining sign ambiguity concerning the short in-plane axis coordinate. © 1994 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.468017
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  • 4
    Electronic Resource
    Electronic Resource
    Rotationally resolved vibronic spectra of the van der Waals modes of benzene–Ar and benzene–Kr complexes (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 104 (1996), S. 865-881 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Rotationally resolved vibronic spectra of eight van der Waals bands built onto the 610 transition of the bare molecule are reported for the complexes C6H6⋅Ar, C6D6⋅Ar, and C6H6⋅84Kr. The rotational structure of most of the bands is identified as that of a perpendicular transition with Coriolis coupling constants nearly the same as those of the 610 band of the respective complex. We therefore conclude that the excited van der Waals modes of the three complexes have a1 symmetry. Precise rotational constants are fitted to the large number of unblended lines assigned in each spectrum. In contrast, the lowest energy van der Waals bands of both C6H6⋅Ar and C6D6⋅Ar display a completely different rotational structure which can neither be explained by a genuine perpendicular nor a genuine parallel transition. This situation will be analyzed in detail in accompanying work and the final vibronic assignments deduced. The rovibronic lines in all the spectra show a linewidth of 130 MHz that is solely due to the laser linewidth and to residual Doppler broadening in the molecular jet. It is concluded that the excited vibronic combination states of intramolecular and van der Waals vibrations do not predissociate on the nanosecond time scale of our experiment. Two of the reported spectra show irregularities in the rotational structure that are explained by coupling to adjacent combination states. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.470811
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  • 5
    Electronic Resource
    Electronic Resource
    Coherent ion dip spectroscopy of the ground state benzene–Ar complex: Vibration–rotation levels up to 130 cm−1 intermolecular energy (1995)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 103 (1995), S. 3315-3324 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Coherent ion dip spectroscopy (CIS) provides high sensitivity and high resolution for the investigation of vibrational overtones in molecular electronic ground states. For a special time sequence of two coherent narrow-band Fourier transform limited nanosecond UV light pulses, with a modest delay of the pump pulse of 6.4 ns, a complete blocking of the population transfer to the upper state is achieved in the lambda-type three-level system ion dip experiment. This leads to ion dips with a depth as large as 95% and each dip represents an individual rovibronic transition. In this work, CIS is applied for the first time to a weakly bound van der Waals complex, benzene–Ar. We are able to observe six new van der Waals vibrational states up to an excess energy of 130 cm−1. The assignments are made by comparison with recent S1 excited state data of benzene–Ar and p-difluorobenzene–Ar and by analysis of the positions and intensities of the observed individual rotational lines. The frequency positions of the intermolecular vibrational states display a regular pattern up to 130 cm−1. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.470265
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