AU - Vauthey, E.
AU - Voss, J.
AU - De Caro, C.
AU - Renn, A.
AU - Wild, U.P.
TI - Spectral Hole-Burning and Stark Effect: Frequency Dependence of the Induced Dipole Moment of a Squaraine Dye in Polymers
PY - 1994
JF - Chemical Physics
JA - Chem. Phys.
SN - 0301-0104
VL - 184
SP - 347
EP - 356
L1 - http://www.sciencedirect.com/science?_ob=MImg&_imagekey=B6TFM-44CR1R0-7B-1&_cdi=5230&_orig=browse&_coverDate=06%2F15%2F1994&_sk=998159998&view=c&wchp=dGLbVlb-lSztz&_acct=C000043220&_version=1&_userid=779890&md5=ba4b62ba9af8cbce28280d155f3da88d&ie=f.pdf
L3 - http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFM-44CR1R0-7B&_user=779890&_handle=W-WA-A-A-BC-MsSAYWA-UUW-AUCUADYEVD-VEBYZCDAB-BC-U&_fmt=summary&_coverDate=06%2F15%2F1994&_rdoc=30&_orig=browse&_srch=%23toc%235230%231994%23998159998%23271280!&_cdi=5230&view=c&_acct=C000043220&_version=1&_urlVersion=0&_userid=779890&md5=10ba871536ebcf6fdd911d3345c04554
M3 - 10.1016/0301-0104(94)00078-6
UR - http://dx.doi.org/10.1016/0301-0104(94)00078-6
N2 - A study of the effect of an external electric field on spectral holes burnt at different frequencies in the inhomogeneous absorption band of a centrosymmetric squaraine dye, bis [4-(diethylamino)-2-hydroxyphenyl] squaraine (DEAH), in polymers of different polarity is presented. Average matrix induced dipole moment differences of about 1 D and 0.37 D were measured in the directions parallel and perpendicular to the long axis of DEAH. In all polymers investigated, the induced dipole moment difference decreased from the higher to the lower frequencies. Solvatochromic shift measurements were performed in order to elucidate the origin of this effect. The matrix field inducing the dipole moment is also partially responsible for the frequency shift of the absorption of DEAH. With increasing matrix field, the absorptiion frequency is shifted to the blue due to electrostatic interaction with the local dipoles of DEAH. The contribution of the electrostatic interactions to the frequency shift is smaller than the dispersion interactions by two orders of magnitude in polystyrene, but increases slightly in more polar polymers.
ID - 115
ER -

AU - Burget, D.
AU - Jacques, P.
AU - Vauthey, E.
AU - Suppan, P.
AU - Haselbach, E.
TI - The Marcus Inverted Region: Role of the Nature of the Donor-Acceptor Pair and Free Ion Yields
PY - 1994
JF - Journal of the Chemical Society. Faraday transactions
JA - J. Chem. Soc. Faraday trans.
SN - 0956-5000
VL - 90
IS - 17
SP - 2481
L1 - http://www.rsc.org/ejarchive/FT/1994/FT9949002481.pdf
L3 - http://www.rsc.org/Publishing/Journals/FT/article.asp?doi=FT9949002481
M3 - 10.1039/FT9949002481
UR - http://dx.doi.org/10.1039/FT9949002481
N2 - The free ion yield (R) resulting from the fluorescence quenching of 9,10-dicyanoanthracene (DCA) by various electron donors in acetonitrile has been studied using ns laser photoconductivity. The influence of the chemical nature of the doors is established in a general manner. For a given oxidation potential Eox(D/D+), the rate constant of geminate ion recombination, kbac, decreases significantly as the electronic delocalization of the donor increases. As a consequence multiple Marcus plots are observed in the inverted region. These plots show decreasing curvature when going from stilbenes to amines as donors. This fan effect is tentatively explained by considering the detailed roles of the parameters V, and h in the Marcus model.
ID - 114
ER -

AU - Vauthey, E.
AU - Pariat, Y.
AU - Henseler, A.
TI - Picosecond Transient Grating Spectroscopy: An Application of Holography for Investigating Ultrafast Photoinduced Processes
PY - 1994
JF - Chimia
JA - Chimia
SN - 0009-4293
VL - 48
IS - 9
SP - 397
EP - 400
L1 - http://www.ingentaconnect.com/search/download?pub=infobike%3a%2f%2fscs%2fchimia%2f1994%2f00000048%2f00000009%2fart00015&mimetype=application%2fpdf&exitTargetId=1252397509604
L3 - http://www.ingentaconnect.com/content/scs/chimia/1994/00000048/00000009/art00015
N2 - The principles of ps transient grating spectroscopy are presented. The capabilities of this technique for the study of photoinduced processes are illustrated by several new results. These include the observation of an anomalous effect in the reorientation dynamics of two ionic dyes in long-chain alkanenitriles, the measurement of the local viscosity in the interior of reverse micelles containing methanol, and the determination of the rate constant of separation of a geminate radical pair formed by photoinduced electron-transfer reaction.
ID - 113
ER -

AU - Henseler, A.
AU - Vauthey, E.
TI - Picosecond Transient Grating Study of the Rotational Diffusion of a Ruthenium Complex in Solution
PY - 1994
JF - Chemical Physics Letters
JA - Chem. Phys. Lett.
SN - 0009-2614
VL - 228
IS - 1-3
SP - 66
EP - 72
L1 - http://www.sciencedirect.com/science?_ob=MImg&_imagekey=B6TFN-44F1R2K-KN-1&_cdi=5231&_orig=browse&_coverDate=09%2F30%2F1994&_sk=997719998&view=c&wchp=dGLbVzb-lSztz&_acct=C000043220&_version=1&_userid=779890&md5=11d932c426c58f58c07f22bc050de88b&ie=f.pdf
L3 - http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFN-44F1R2K-KN&_user=779890&_handle=W-WA-A-A-VZ-MsSAYWW-UUW-AUCUAZWZYV-VEBWACEZV-VZ-U&_fmt=summary&_coverDate=09%2F30%2F1994&_rdoc=11&_orig=browse&_srch=%23toc%235231%231994%23997719998%23272602!&_cdi=5231&view=c&_acct=C000043220&_version=1&_urlVersion=0&_userid=779890&md5=a9974027f130efec796c2cfab9c0d18f
M3 - 10.1016/0009-2614(94)00914-7
UR - http://dx.doi.org/10.1016/0009-2614(94)00914-7
N2 - The rotational diffusion time of ruthenium (II)-bis(2,2\'-bipyridine) (2,2\'-biquinoleine) has been measured in polar solvents of different viscosity. The rotational dynamics can be explained in terms of the Stokes—Einstein—Debye hydrodynamics theory under stick boundary condition by considering the rotating body as a prolate spheroid enclosing the complex. This overestimates the intrinsic molecular volume by a factor of 1.5. The difference can be accounted for by solvent molecules intercalated in the interligand space and stabilized by electrostatic interaction with the charge of the metal atom.
ID - 112
ER -

AU - Vauthey, E.
AU - Parker, A.W.
AU - Nohova, B.
AU - Phillips, D.
TI - Time Resolved Resonance Raman Study of the Rate of Separation of a Geminate Ion Pair into Free Ions in a Medium Polarity Solvent
PY - 1994
JF - Journal of the American Chemical Society
JA - J. Am. Chem. Soc.
SN - 0002-7863
VL - 116
IS - 20
SP - 9182
EP - 9186
L1 - http://pubs.acs.org/doi/pdf/10.1021/ja00099a037
L3 - http://pubs.acs.org/doi/abs/10.1021/ja00099a037
M3 - 10.1021/ja00099a037
UR - http://dx.doi.org/10.1021/ja00099a037
N2 - The rate of separation into free ions of a geminate ion pair generated by photoinduced electron transfer between 9,lO-anthraquinone excited to the lowest triplet state and 1,2,4-trimethoxybenzenein 1,1,2,2-tetrachloroethane has been measured at different temperatures by nanosecond time-resolved resonance Raman spectroscopy (TR3). The intrinsic activation energy for the separation amounts to 0.04 eV, suggesting that the center-to-center interionic distance in the geminate ion pair is about 7.5 A. The activation barrier is due to a loss of electrostatic stabilization upon separation to a distance of about 9.5 A, where a solvent molecule or part of it can interpenetrate to increase the solvation energy. This suggests that the geminate ion pair is a loose ion pair but is not truly solvent separated.
ID - 111
ER -