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  • 1
    Electronic Resource
    Electronic Resource
    Charge Separation in Donor-Chromophore-Acceptor Assemblies: Linkage and Driving Force Dependence of Photoinduced Electron Transfers (1995)
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 99 (1995), S. 6530-6539 
    Details
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/j100017a038
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  • 2
    Electronic Resource
    Electronic Resource
    Relaxation and electron transfer dynamics in bare and DTDCI sensitized MoS2 nanoclusters (2000)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 113 (2000), S. 5448-5456 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The trapping dynamics of photogenerated electrons and holes in MoS2 nanoclusters has been studied using time resolved emission polarization and absorption spectroscopies. These results are compared to absorption kinetics obtained on MoS2 nanoclusters with adsorbed DTDCI (DTDCI≡diethylthiodicarbocyanine iodide) dye. The results indicate that emission from the MoS2 band edge state is polarized, while emission from trapped electrons and holes is unpolarized. This polarization difference is used to obtain the electron and hole trapping times and values of 275 ps and 42 ps, respectively, are obtained. Decays having the same time constants are observed in the transient absorption results. The results obtained on the MoS2/DTDCI system show that electron injection occurs with a time constant of 12 ps. These kinetics also show a 225 ps decay component which is assigned to electron trapping and reverse electron transfer. The 225 ps decay time along with the 275 ps trapping time indicates that reverse electron transfer from the conduction band has a time constant of about 1.2 ns. Following trapping, reverse electron transfer from deep traps is slow. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1289765
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  • 3
    Electronic Resource
    Electronic Resource
    Electron transfer dynamics in MoS2 nanoclusters: Normal and inverted behavior (1996)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 104 (1996), S. 4978-4987 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The photophysics and electron transfer (ET) dynamics of quantum confined MoS2 nanoclusters have been studied using static and time resolved emission spectroscopy. The MoS2 nanoclusters consist of a single S–Mo–S trilayer, having diameters of ∼2.5 or 4.5 nm. Two types of electron acceptors are adsorbed on these nanoclusters: 2,2′-bipyridine (bpy) and 4,4′,5,5′-tetramethyl-2,2′-bipyridine (TMB). The ET reaction exothermicities may be varied by changing the electron acceptor or by varying the size of the MoS2 nanocluster. TMB is harder to reduce, and thus has a smaller ET driving force than bpy. The smaller nanoclusters have a higher energy conduction band, and thus have a larger ET driving force. In all cases, the ET driving force may be calculated from bulk MoS2 properties and quantum confinement theory. Both "normal'' and "inverted'' behaviors are observed. A reorganization energy of 0.40 eV is calculated from energy dependent ET rates. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.471128
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  • 4
    Electronic Resource
    Electronic Resource
    Proton transfer dynamics in substituted 3-hydroxyflavones: Solvent polarization effects (1993)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 99 (1993), S. 211-221 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The spectroscopy and excited state proton transfer (ESPT) dynamics of 4'-N,N-dimethylamino-3HF (I) and 4'-N,N-diethylamino-3HF (II) have been studied in acetonitrile/benzene solvent mixtures. Solvent composition-dependent spectral shifts are observed and can be understood in terms of an Onsager cavity model. Analysis of these spectral shifts accurately predicts solvent composition-dependent excited state equilibrium constants, which are also experimentally determined. The ESPT rates are analyzed within the framework of a transition state theory treatment of solvent polarization-mediated proton transfer. This treatment is analogous to electron transfer theory. In this treatment, the energetics of the transition state are largely determined by known solvent properties and the solvent-dependent spectroscopy. This analysis yields solvent-dependent ESPT activation energies. The corresponding calculated ESPT rates are in excellent agreement with the experimentally determined rates.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.465799
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  • 5
    Electronic Resource
    Electronic Resource
    Interligand electron transfer and transition state dynamics in Ru(II)trisbipyridine (1991)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 95 (1991), S. 8970-8976 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The interligand electron transfer (ILET) dynamics in the excited metal-to-ligand charge transfer state of RuIItrisbipyridine have been studied using picosecond time-resolved absorption polarization spectroscopy. The ILET dynamics have been studied in several solvents with widely varying relaxation times, and over the temperature range of −85 °C to room temperature. The solvents studied include acetonitrile, propanol, ethylene glycol, and glycerol. The results show that ILET is relatively fast in acetonitrile (∼47 ps), slower and nonexponential in propanol and ethylene glycol (∼30–200 ps), and fast in glycerol (∼30 ps). The glycerol results are roughly temperature independent. These results can be understood in terms of a model in which photoexcitation places the system near the ILET transition state and solvent relaxation competes with ILET in the nascent distribution. Following solvent relaxation a slower, steady state (probably transition state theory) rate is obtained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.461228
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  • 6
    Electronic Resource
    Electronic Resource
    Vibrational dynamics of aniline (N2)1 clusters in their first excited singlet state (1992)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 96 (1992), S. 4904-4910 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The first excited singlet state S1 vibrational dynamics of aniline(N2)1 clusters are studied and compared to previous results on aniline(CH4)1 and aniline(Ar)1. Intramolecular vibrational energy redistribution (IVR) and vibrational predissociation (VP) rates fall between the two extremes of the CH4 (fast IVR, slow VP) and Ar (slow IVR, fast VP) cluster results as is predicted by a serial IVR/VP model using Fermi's golden rule to describe IVR processes and a restricted Rice–Ramsperger–Kassel–Marcus (RRKM) theory to describe unimolecular VP rates. The density of states is the most important factor determining the rates. Two product states, 00 and 10b1, of bare aniline and one intermediate state ∼(00) in the overall IVR/VP process are observed and time resolved measurements are obtained for the 000 and ∼(000) transitions. The results are modeled with the serial mechanism described above.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.462780
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  • 7
    Electronic Resource
    Electronic Resource
    Vibrational dynamics of aniline(Ar)1 and aniline(CH4)1 clusters (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 91 (1989), S. 5268-5277 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The first excited electronic state (S1) vibrational dynamics of aniline(Ar)1 and aniline(CH4)1 van der Waals (vdW) clusters have been studied using molecular jet and time resolved emission spectroscopic techniques. The rates of intramolecular vibrational energy redistribution (IVR) and vibrational predissociation (VP) as functions of vibrational energy are reported for both clusters. For vibrational energy in excess of the cluster binding energy, both clusters are observed to dissociate. The dispersed emission spectra of these clusters demonstrate that aniline(Ar)1 dissociates to all energetically accessible bare molecule states and that aniline(CH4)1 dissociates selectively to only the bare molecule vibrationless state. The emission kinetics show that in the aniline(Ar)1 case, the initially excited states have nanosecond lifetimes, and intermediate cluster states have very short lifetimes. In contrast, the initially excited aniline(CH4)1 states and other intermediate vibrationally excited cluster states are very short lived (〈100 ps), and the intermediate cluster 00 state is observed. These results can be understood semiquantitatively in terms of an overall serial IVR/VP mechanism which consists of the following: (1) the rates of chromophore to vdW mode IVR are given by Fermi's golden rule, and the density of vdW vibrational states is the most important factor in determining the relative [aniline(Ar)1 vs aniline(CH4)1] rates of IVR; (2) IVR among the vdW modes is rapid; and (3) VP rates can be calculated by a restricted vdW mode phase space Rice–Ramsberger–Kassel–Marcus theory. Since the density of vdW states is three orders of magnitude greater for aniline(CH4)1 than aniline(Ar)1 at 700 cm−1, the model predicts that IVR is slow and rate limiting in aniline(Ar)1, whereas VP is slow and rate limiting in aniline(CH4)1. The agreement of these predictions with the experimental results is very good and is discussed in detail.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.457572
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  • 8
    Electronic Resource
    Electronic Resource
    Excited state intermolecular proton transfer in matrix isolated β-naphthol/ammonia complexes (1989)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 90 (1989), S. 5243-5251 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The spectroscopy and proton transfer dynamics of matrix isolated β-naphthol⋅(NH3)n, n=1,2...complexes have been studied. The complexes are formed by annealing of β-naphthol/NH3/argon matrices. The annealing studies indicate that the n=3, and probably n=4, complexes undergo excited state intermolecular proton transfer (ESPT), and this assignment is confirmed by comparison of experimental and simulated spectra. Time resolved emission studies indicate that the ESPT time is about 20 ps. These results are discussed in terms of simple tunneling theories.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.456478
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  • 9
    Electronic Resource
    Electronic Resource
    An amplified tunable picosecond dye laser based on an active-passive mode-locked Nd:YAG laser (1989)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 60 (1989), S. 2592-2595 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: An amplified tunable picosecond dye laser has been constructed which is pumped by an active-passive mode-locked Nd:YAG laser. The laser is tunable from 555 nm to 〉700 nm. It provides a maximum of 2-mJ pulses with pulse widths of ∼17 ps (FWHM). The tuning range can be extended by frequency doubling and/or mixing with the residual 1064-nm pulses. The dye laser is very stable and relatively inexpensive to construct.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1140676
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  • 10
    Electronic Resource
    Electronic Resource
    Charge separation in donor-chromophore-acceptor complexes: inverted region behavior in reverse electron transfer reactions (1992)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 114 (1992), S. 9504-9509 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00050a032
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