Coherent phonons in fullerites with femtosecond laser excitation
Dobryakov A. L. , Letokhov V. S. , Lozovik Yu. E. , Matveets Yu. A., Farztdinov V. M. , Kovalenko S. A. , Ernsting N. R. , Marovskii G.
The excitation of coherent phonons in the frequency range 10-400 cm"1, including ungerade phonons, in a wide spectral probe range frioprobe= 1.78-2.34 eV, was observed by femtosecond laser spectroscopy according to the time-dependent changes in the optical density of a C60 film. The spectral dependence of the photoinduced response makes it possible to separate selectively the relaxation of electrons in different bands. The possibility of reversible polymerization in the excited state is discussed. © 1995 American Institute of Physics.
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![](/ps/1211/article_18301_800_head.png "The excitation of coherent phonons in the frequency range 10-400 cm"<sup>1</sup>, including ungerade phonons, in a wide spectral probe range frio<sub>probe</sub>= 1.78-2.34 eV, was observed by femtosecond laser spectroscopy according to the time-dependent changes in the optical density of a C<sub>60</sub> film. The spectral dependence of the photoinduced response makes it possible to separate selectively the relaxation of electrons in different bands. The possibility of reversible polymerization in the excited state is discussed. <i>© 1995 American Institute of Physics.</i>")