TY - JOUR
AU - Vauthey, E.
TI - Effect of Steric Hindrance on the Dynamics of Charge Recombination within Geminate Ion Pairs
PY - 2000
JF - Journal of Physical Chemistry A
JA - J. Phys. Chem. A
SN - 1089-5639
VL - 104
IS - 9
SP - 1804
EP - 1810
L1 - http://pubs.acs.org/doi/pdf/10.1021/jp993522d
L2 - http://pubs.acs.org/doi/full/10.1021/jp993522d
L3 - http://pubs.acs.org/doi/abs/10.1021/jp993522d
L4 - http://www.unige.ch/sciences/chifi/publis/pics/double/ref00092.png
M3 - 10.1021/jp993522d
UR - http://dx.doi.org/10.1021/jp993522d
N2 - The dynamics of charge recombination within geminate ion pairs formed by electron transfer (ET) quenching of excited aromatic hydrocarbons by aliphatic and aromatic amines was investigated using picosecond transient grating spectroscopy. With aliphatic donors, the rate constant of back ET, kBET, shows a substantial decrease with increasing steric encumbrance around the N atom. No correlation between kBET and the exergonicity of the process was observed. This effect is ascribed to a decrease of the electronic coupling matrix element, V, which is affected by both the distance between the N atom of the donor and the aromatic plane of the acceptor and by the delocalization of the hole upon increasing the bulkiness of the alkyl substituents. With aromatic amines, kBETis substantially slower than with the unhindered amines. This is also explained in terms of a smaller value of V because of charge delocalization.
ID - 92
ER -

TY - JOUR
AU - Muller, P.-A.
AU - Hoegemann, C.
AU - Allonas, X.
AU - Jacques, P.
AU - Vauthey, E.
TI - Deuterium Isotope Effect on the Charge Recombination Dynamics of Contact Ion Pairs Formed by Electron-Transfer Quenching in Acetonitrile
PY - 2000
JF - Chemical Physics Letters
JA - Chem. Phys. Lett.
SN - 0009-2614
VL - 326
IS - 3-4
SP - 321
EP - 327
L1 - http://www.sciencedirect.com/science?_ob=MImg&_imagekey=B6TFN-40XNWWD-P-B&_cdi=5231&_orig=browse&_coverDate=08%2F18%2F2000&_sk=996739996&wchp=dGLSzV-lSzBA&_acct=C000043220&_version=1&_userid=779890&md5=4dbc41b8062c5caf0d0ce5b8de433ac2&ie=f.pdf
L2 - http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFN-40XNWWD-P&_user=779890&_coverDate=08%2F18%2F2000&_rdoc=20&_fmt=full&_orig=browse&_srch=%23toc%235231%232000%23996739996%23206079!&_cdi=5231&_sort=d&_acct=C000043220&_version=1&_urlVersion=0&_userid=779890&md5=55af1024ae712428dc2da8425157ca6b
L3 - http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFN-40XNWWD-P&_user=779890&_coverDate=08%2F18%2F2000&_rdoc=20&_fmt=summary&_orig=browse&_srch=%23toc%235231%232000%23996739996%23206079!&_cdi=5231&_sort=d&_docanchor=&_acct=C000043220&_version=1&_urlVersion=0&_userid=779890&md5=f9c8aa45099e9112ad5100e7c2b2ebed
M3 - 10.1016/S0009-2614(00)00791-0
UR - http://dx.doi.org/10.1016/S0009-2614(00)00791-0
N2 - The deuterium isotope effect on the fluorescence lifetime of contact ions pairs (CIP) composed of 9,10-dicyanoanthracene and weak aromatic electron donors in acetonitrile has been investigated. For all pairs studied, an increase of the emission lifetime with increasing deuterium substitution on both the electron acceptor and the electron donor was observed. The free ion yield shows the same variation upon deuteration. It is concluded that the efficiency of free ions formation is essentially determined by the competition, within the CIP, between charge recombination and dissociation into free ions and that loose ion pairs do not play a significant role.
ID - 91
ER -

TY - CHAP
AU - Vauthey, E.
TI - Investigation of the Ultrafast Dynamics of Charge Recombination of Ion Pairs Using Multiplex Transient Grating Spectroscopy
PY - 2000
BT - Ultrafast Phenomena XII
PB - (T. Elsaesser, S. Mukamel, M. M. Murnane and N.F. Scherer Eds), Springer: Berlin
SP - 485
ID - 90
ER -

TY - JOUR
AU - Vauthey, E.
TI - Applications of Transient Grating Techniques for Investigating Ultrafast Processes
PY - 2000
JF - EPA Newsletter
JA - EPA Newslett.
SN - 1035-1701
VL - 70
SP - 30
EP - 57
ID - 89
ER -