It has recently been suggested that the lifetime of the lowest triplet state in multiphoton-excited is much longer than anticipated. If true, this would invalidate the assumption of internal thermal equilibrium in the description of statistical decay processes of the molecule, such as thermionic emission. We present pump–probe measurements which show that the lifetime is below 1 μs at vibrational excitation energies of 6.5 eV, and that it decreases further to 40 ns at 10 eV.
REFERENCES
1.
R. E.
Haufler
, L. S.
Wang
, L. P. F.
Chibante
, C.
Jin
, J.
Conceicao
, Y.
Chai
, and R. E.
Smalley
, Chem. Phys. Lett.
179
, 449
(1991
).2.
3.
G.
von Helden
, I.
Holleman
, A. J. A.
Vanroij
, G. M. H.
Knippels
, A. F. G.
Vandermeer
, and G.
Meijer
, Phys. Rev. Lett.
81
, 1825
(1998
).4.
F.
Rohmund
, M.
Heden
, A. V.
Bulgakov
, and E. E. B.
Campbell
, J. Chem. Phys.
115
, 3068
(2001
).5.
H. T.
Etheridge
, R. D.
Averitt
, N. J.
Halas
, and R. B.
Weisman
, J. Phys. Chem.
99
, 11306
(1995
).6.
7.
R. Deng, M. Treat, O. Echt, and K. Hansen, unpublished results.
8.
9.
A discrepancy between the fit and the medium-fluence data for long delays is most likely due to problems with background subtraction. The pump-only signal is on the order of 1% of the pump–probe signal obtained for short delays.
10.
11.
M. Heden, A. V. Bulgakov, K. Mehlig, and E. E. B. Campbell, contribution to ISSPIC11, Strasbourg, September 9–13, 2002.
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