TY - CHAP
AU - Nicolet, Olivier
AU - Vauthey, Eric
TI - Non-equilibrium charge recombination dynamics of excited donor-acceptor complexes
PY - 2003
BT - Ultrafast Phenomena XIII
PB - Springer Series in Chemical Physics
SP - 432
EP - 434
ID - 650
ER -

TY - JOUR
AU - Dolotova, Elena
AU - Dogadkin, Denis
AU - Soboleva, Irina
AU - Kuzmin, Michael
AU - Nicolet, Oliver
AU - Vauthey, Eric
TI - Lifetimes of partial charge transfer exciplexes of 9-cyanophenanthrene and 9-cyanoanthracene
PY - 2003
JF - Chemical Physics Letters
JA - Chem. Phys. Lett.
SN - 0009-2614
VL - 380
IS - 5-6
SP - 729
EP - 735
L1 - http://www.sciencedirect.com/science?_ob=MImg&_imagekey=B6TFN-49RCK03-6-3P&_cdi=5231&_orig=browse&_coverDate=10%2F28%2F2003&_sk=996199994&view=c&wchp=dGLbVlb-zSkzV&_acct=C000043220&_version=1&_userid=779890&md5=a049290d867ae77379c1082bf0ac42d6&ie=f.pdf
L2 - http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFN-49RCK03-6&_user=779890&_handle=W-WA-A-A-VV-MsSAYVA-UUW-AUDAWAUDAC-AVBVUZBEA-VV-U&_fmt=full&_coverDate=10%2F28%2F2003&_rdoc=36&_orig=browse&_srch=%23toc%235231%232003%23996199994%23466667!&_cdi=5231&view=c&_acct=C000043220&_version=1&_urlVersion=0&_userid=779890&md5=f8cd0703e7b1d1715b0919cec0ab072d
L3 - http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFN-49RCK03-6&_user=779890&_handle=W-WA-A-A-VV-MsSAYVA-UUW-AUDAWAUDAC-AVBVUZBEA-VV-U&_fmt=summary&_coverDate=10%2F28%2F2003&_rdoc=36&_orig=browse&_srch=%23toc%235231%232003%23996199994%23466667!&_cdi=5231&view=c&_acct=C000043220&_version=1&_urlVersion=0&_userid=779890&md5=ebd885939961cdeb0958407fbb9a65b9
M3 - 10.1016/j.cplett.2003.09.083
UR - http://dx.doi.org/10.1016/j.cplett.2003.09.083
N2 - The fluorescence decays of several exciplexes with partial charge transfer have been investigated in solvents of various polarity. The measured lifetimes are found to be in reasonable agreement with the activation enthalpy and entropy of exciplex decay obtained earlier from the temperature dependence of the exciplex emission quantum yields. For exciplexes with 9-cyanophenanthrene substantial contribution of the higher local excited state into the exciplex electronic structure is found and borrowed intensity effect enhances the exciplex emission rate constants.
ID - 526
ER -

TY - JOUR
AU - Jacques, P.
AU - Allonas, X.
AU - Sarbach, A.
AU - Haselbach, E.
AU - Vauthey, E.
TI - Tuning the ion formation processes from triplet-triplet annihilation to triplet-mediated photoionization
PY - 2003
JF - Chemical Physics Letters
JA - Chem. Phys. Lett.
SN - 0009-2614
VL - 378
IS - 1-2
SP - 185
EP - 191
L1 - http://www.sciencedirect.com/science?_ob=MImg&_imagekey=B6TFN-49981S4-1-1G&_cdi=5231&_orig=browse&_coverDate=08%2F29%2F2003&_sk=996219998&view=c&wchp=dGLbVzb-zSkWW&_acct=C000043220&_version=1&_userid=779890&md5=0682805d75ac6004eebd12eaaf86e812&ie=f.pdf
L2 - http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFN-49981S4-1&_user=779890&_handle=W-WA-A-A-BZ-MsSAYWW-UUW-AUDAWADCDC-AVBVEWZCB-BZ-U&_fmt=full&_coverDate=08%2F29%2F2003&_rdoc=30&_orig=browse&_srch=%23toc%235231%232003%23996219998%23449964!&_cdi=5231&view=c&_acct=C000043220&_version=1&_urlVersion=0&_userid=779890&md5=6e057442c6f080952dad430544a8bb8c
L3 - http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFN-49981S4-1&_user=779890&_handle=W-WA-A-A-BZ-MsSAYWW-UUW-AUDAWADCDC-AVBVEWZCB-BZ-U&_fmt=summary&_coverDate=08%2F29%2F2003&_rdoc=30&_orig=browse&_srch=%23toc%235231%232003%23996219998%23449964!&_cdi=5231&view=c&_acct=C000043220&_version=1&_urlVersion=0&_userid=779890&md5=85d4d9924b993425193ca920df473085
M3 - 10.1016/S0009-2614(03)01211-9
UR - http://dx.doi.org/10.1016/S0009-2614(03)01211-9
N2 - Free ion formation in acetonitrile is examined through transient photoconductivity for a set of ketones excited at different wavelengths. According to the photophysical parameters of the ketones and the incident photon energy, two mechanisms can be operative: triplet–triplet annihilation (bimolecular process) and/or photoionization (monomolecular biphotonic process). By using a tunable laser, excited state mediated photoionization was studied. From the threshold energy (Ethr) required for this process to occur, ionization potentials in solution (IS) were deduced and compared to the corresponding values in gas phase (IG). A simple energetic model enables the determination of the oxidation potential (Eox) of the ketones that are compared to the corresponding values obtained through electrochemical measurements.
ID - 525
ER -

TY - JOUR
AU - Moore, E.G.
AU - Bernhardt, P.V.
AU - Pigliucci, A.
AU - Riley, M.J.
AU - Vauthey, E.
TI - Rates of Electronic Energy Transfer in Conformationally Flexible Bichromophoric Macrocyclic Complexes: A Combined Experimental and Molecular Modeling Study
PY - 2003
JF - Journal of Physical Chemistry A
JA - J. Phys. Chem. A
SN - 1089-5639
VL - 107
IS - 41
SP - 8396
EP - 8403
L1 - http://pubs.acs.org/cgi-bin/article.cgi/jpcafh/2003/107/i41/pdf/jp035781f.pdf
L2 - http://pubs.acs.org/cgi-bin/article.cgi/jpcafh/2003/107/i41/html/jp035781f.html
L3 - http://pubs.acs.org/cgi-bin/abstract.cgi/jpcafh/2003/107/i41/abs/jp035781f.html
L4 - http://www.unige.ch/sciences/chifi/publis/pics/double/ref00488.png
M3 - 10.1021/jp035781f
UR - http://dx.doi.org/10.1021/jp035781f
N2 - Electronic energy transfer (EET) rate constants between a naphthalene donor and anthracene acceptor in [ZnL4a](ClO4)2 and [ZnL4b](ClO4)2 were determined by time-resolved fluorescence where L4a and L4b are the trans and cis isomers of 6-((anthracen-9-yl-methyl)amino)-6,13-dimethyl-13-((naphthalen-1-yl-methyl)amino)-1,4,8,11-tetraazacyclotetradecane, respectively. These isomers differ in the relative disposition of the appended chromophores with respect to the macrocyclic plane. The trans isomer has an energy transfer rate constant (kEET) of 8.7 × 108 s-1, whereas that of the cis isomer is significantly faster (2.3 × 109 s-1). Molecular modeling was used to determine the likely distribution of conformations in CH3CN solution for these complexes in an attempt to identify any distance or orientation dependency that may account for the differing rate constants observed. The calculated conformational distributions together with analysis by 1H NMR for the [ZnL4a]2+ trans complex in the common trans-III N-based isomer gave a calculated Förster rate constant close to that observed experimentally. For the [ZnL4b]2+ cis complex, the experimentally determined rate constant may be attributed to a combination of trans-III and trans-I N-based isomeric forms of the complex in solution.
ID - 488
ER -

TY - JOUR
AU - Nicolet, Olivier
AU - Vauthey, Eric
TI - Heavy Atom Effect on the Charge Recombination Dynamics of Photogenerated Geminate Ion Pairs
PY - 2003
JF - Journal of Physical Chemistry A
JA - J. Phys. Chem. A
SN - 1089-5639
VL - 107
IS - 31
SP - 5894
EP - 5902
L1 - http://pubs.acs.org/cgi-bin/article.cgi/jpcafh/2003/107/i31/pdf/jp0276247.pdf
L2 - http://pubs.acs.org/cgi-bin/article.cgi/jpcafh/2003/107/i31/html/jp0276247.html
L3 - http://pubs.acs.org/cgi-bin/abstract.cgi/jpcafh/2003/107/i31/abs/jp0276247.html
M3 - 10.1021/jp0276247
UR - http://dx.doi.org/10.1021/jp0276247
N2 - The charge recombination dynamics of geminate ion pairs formed by electron transfer quenching of cyanoanthracene derivatives by bromo- and iodo-anisole in acetonitrile was investigated using various ultrafast spectroscopic techniques. Without a heavy atom, the only charge recombination pathway is that leading to the neutral ground state. With heavy atom substituted anisoles, charge recombination to the local triplet state of the excited precursor is observed. Time constants for triplet charge recombination ranging from 400 ps to less than 10 ps, depending on the heavy atom and on the energy gap between the ion pair and the triplet state, have been measured. This heavy atom effect was observed with ion pairs formed upon electron-transfer quenching with driving force going from −0.15 to −0.6 eV, suggesting that these intermediates are in fact exciplexes. A new scheme for producing free ions with a high yield using this effect and a secondary electron donor is also demonstrated.
ID - 329
ER -

TY - JOUR
AU - Morandeira, Ana
AU - Fürstenberg, Alexandre
AU - Gumy, Jean-Claude
AU - Vauthey, Eric
TI - Fluorescence Quenching in Electron-Donating Solvents. 1. Influence of the Solute-Solvent Interactions on the Dynamics
PY - 2003
JF - Journal of Physical Chemistry A
JA - J. Phys. Chem. A
SN - 1089-5639
VL - 107
IS - 28
SP - 5375
EP - 5383
L1 - http://pubs.acs.org/cgi-bin/article.cgi/jpcafh/2003/107/i28/pdf/jp0343133.pdf
L2 - http://pubs.acs.org/cgi-bin/article.cgi/jpcafh/2003/107/i28/html/jp0343133.html
L3 - http://pubs.acs.org/cgi-bin/abstract.cgi/jpcafh/2003/107/i28/abs/jp0343133.html
L4 - http://www.unige.ch/sciences/chifi/publis/pics/double/ref00308.png
M3 - 10.1021/jp0343133
UR - http://dx.doi.org/10.1021/jp0343133
N2 - The electron transfer (ET) quenching dynamics of excited perylene (Pe), cyanoperylene (PeCN), methanolperylene (PeOH), and methylperylene (PeMe) in N,N-dimethylaniline (DMA) has been investigated using ultrafast fluorescence up-conversion. Measurements of the rotational dynamics of PeCN and PeMe in nonpolar and polar inert solvents using optically heterodyned polarization spectroscopy are also presented. The fluorescence decay in DMA is strongly nonexponential and about 10 times faster with PeCN than with the other electron acceptors. The quenching dynamics has been analyzed with a model distinguishing three types of donor molecules surrounding the acceptor:  those with optimal orientation for ET and those requiring orientational or translational diffusion prior to ET. According to this model, which can account for the whole fluorescence decay, the faster quenching dynamics of PeCN is not due to a larger ET rate constant, but to a larger number of donor molecules, typically three to four, with an optimal orientation. This is explained by the effect of dipole−dipole interaction between PeCN and the donor molecules, which favors mutual orientations with a large electronic coupling. With the other acceptors, this interaction is either not present or does not lead to ET active geometries. The occurrence of this interaction is substantiated by the rotational dynamics measurements.
ID - 308
ER -

TY - JOUR
AU - Pigliucci, A.
AU - Vauthey, E.
TI - Vibrational Relaxation Dynamics of Polyatomic Molecules in Solution
PY - 2003
JF - Chimia
JA - Chimia
SN - 0009-4293
VL - 57
IS - 4
SP - 200
EP - 203
L1 - http://www.ingentaconnect.com/search/download?pub=infobike%3a%2f%2fscs%2fchimia%2f2003%2f00000057%2f00000004%2fart00015&mimetype=application%2fpdf&exitTargetId=1184070798832
L3 - http://www.ingentaconnect.com/content/scs/chimia/2003/00000057/00000004/art00015
M3 - 10.2533/000942903777679406
UR - http://dx.doi.org/10.2533/000942903777679406
N2 - Ultrafast time-resolved fluorescence measurements have been carried out to investigate vibrational relaxation dynamics of perylene derivatives in solution. The early results obtained with cyanoperylene in acetonitrile are presented and discussed.
ID - 297
ER -

TY - JOUR
AU - Ivanov, A.I.
AU - Belikeev, F.N.
AU - Fedunov, R.G.
AU - Vauthey, E.
TI - The effect of excitation pulse carrier frequency on ultrafast charge recombination dynamics of excited donor-acceptor complexes
PY - 2003
JF - Chemical Physics Letters
JA - Chem. Phys. Lett.
SN - 0009-2614
VL - 372
IS - 1-2
SP - 73
EP - 81
L1 - http://www.sciencedirect.com/science?_ob=MImg&_imagekey=B6TFN-486GCJS-9-6B&_cdi=5231&_orig=browse&_coverDate=04%2F22%2F2003&_sk=996279998&view=c&wchp=dGLbVzb-lSzBS&_acct=C000043220&_version=1&_userid=779890&md5=b7335a32dbb0543b106f836296862d27&ie=f.pdf
L2 - http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFN-486GCJS-9&_user=779890&_handle=W-WA-A-A-VC-MsSAYZW-UUW-AUCBCDYCCY-ZWZZVEWZ-VC-U&_fmt=full&_coverDate=04%2F22%2F2003&_rdoc=11&_orig=browse&_srch=%23toc%235231%232003%23996279998%23414757!&_cdi=5231&view=c&_acct=C000043220&_version=1&_urlVersion=0&_userid=779890&md5=c136a35951b8973123a03b08f416e297
L3 - http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFN-486GCJS-9&_user=779890&_handle=W-WA-A-A-VC-MsSAYZW-UUW-AUCBCDYCCY-ZWZZVEWZ-VC-U&_fmt=summary&_coverDate=04%2F22%2F2003&_rdoc=11&_orig=browse&_srch=%23toc%235231%232003%23996279998%23414757!&_cdi=5231&view=c&_acct=C000043220&_version=1&_urlVersion=0&_userid=779890&md5=14fa1721d0f57713f21ec269f171b565
M3 - 10.1016/S0009-2614(03)00363-4
UR - http://dx.doi.org/10.1016/S0009-2614(03)00363-4
N2 - The excitation of a charge transfer band by a laser pulse of finite duration and the ensuing charge recombination are calculated in the framework of the perturbation theory. The influence of the spectral characteristics of the laser pulse on the charge recombination dynamics is investigated for models including several nuclear modes that differ greatly in their timescales. It is shown that, in the area of applicability of the perturbation theory, the variation of the pulse carrier frequency inside the absorption band can significantly change the effective charge recombination rate constant.
ID - 296
ER -

TY - JOUR
AU - Brodard, P.
AU - Vauthey, E.
TI - Exploring liquid-liquid interfaces with transient evanescent grating techniques
PY - 2003
JF - Review of Scientific Instruments
JA - Rev. Sci. Instr.
SN - 0034-6748
VL - 74
IS - 1
SP - 725
EP - 728
L1 - http://scitation.aip.org/deliver/fulltext/aip/journal/rsi/74/1/1.1517736.pdf?itemId=/content/aip/journal/rsi/74/1/10.1063/1.1517736&mimeType=pdf&containerItemId=content/aip/journal/rsi
L3 - http://dx.doi.org/10.1063/1.1517736
M3 - 10.1063/1.1517736
UR - http://dx.doi.org/10.1063/1.1517736
N2 - A transient grating setup with evanescent wave probing has been developed to investigate ultrafast processes at liquid–liquid interfaces. In order to evaluate the selectivity of this method to the interface, the speed of sound in the low refractive index medium has been measured as a function of the penetration depth of the probe pulse. Our preliminary results indicate an increase of the speed of sound in methanol with decreasing the probe depth from 100 to 70 nm. However, no correlation was found in acetonitrile in the same range. Modifications of the experiment for improving the selectivity to the interface are proposed.
ID - 286
ER -