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Raw photoelectron images in logarithmic color scale. (a) C60, 800 nm, 180 fs, 5.4 TW cm−2, (b) C70, 800 nm, 180 fs, 6.1 TW cm−2, (c) C60 532 nm, ns, (d) C60, 400 nm, 120 fs, 0.26 TW cm−2. The laser polarization direction was parallel to the white arrow shown in (a).
(a) Angle-resolved photoelectron spectra for C60 obtained after (a) 180 fs, 800 nm, 5.4 TW cm−2 excitation and (b) 120 fs, 400 nm, 0.26 TW cm−2 excitation.
Calculated electron yield obtained from Eq. (3) as a function of time for 180 fs, 800 nm, 5.4 TWcm−2 excitation. The laser intensity envelope is also shown for comparison.
The degree of anisotropy Δs (the difference between the parallel and perpendicular effective temperatures) in electron spectra as a function of the ponderomotive shift (U p ) for both C60 and C70 obtained for laser pulses ranging from 120 fs to 3.8 ps. The C70 data were obtained in two different experimental setups. A linear fit to the C60 data is also shown (blue line). The fitted slope was 2.0 ± 0.1. The results from the thermal emission calculations are shown as red diamonds.
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