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11 January 2000 Dynamics of anisotropic Coulomb explosion of C60 under an intense laser field
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Proceedings Volume 3886, High-Power Lasers in Energy Engineering; (2000)
Event: Advanced High-Power Lasers and Applications, 1999, Osaka, Japan
C60 vapor was irradiated with an intense femtosecond laser pulse. Multiply charged carbon ions, up to C4+, were detected in the time-of-flight spectra. We have measured both energy and angular distributions with respect to the laser polarization direction for ions with different charge number. The kinetic energy of ions are distributed above 1 keV. The angular distribution measurement shows that the highly charged ions of C3+ and C4+ are mostly distributed in the direction parallel to the laser polarization, and the C+ ions are slightly distributed in the direction perpendicular to it. These observations clearly indicate that an anisotropic explosion takes place. The average energy of ions with the different charge number is found to be proportional to the square of the charge number, while the maximum energy is proportional to the charge number. Classical molecular dynamics simulations have been successfully carried out reproducing not only the energy spectra but also the angular distributions of ions. The simulations suggest that the most crucial process for the anisotropic Coulomb explosion of C60 is not the electron impact ionization, but the cascade hopping of electrons.
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Junkei Kou, Vasilii Zhakhovskii, Shuji Sakabe, Katsunobu Nishihara, Seiji Shimuzu, Sakae Kawato, Masaki Hashida, Keisuke Shimuzu, Sergei V. Bulanov, Yasukazu Izawa, Yoshiaki Kato, and Nobuaki Nakashima "Dynamics of anisotropic Coulomb explosion of C60 under an intense laser field", Proc. SPIE 3886, High-Power Lasers in Energy Engineering, (11 January 2000);

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