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Anisotropic hot electron emission from fullerenes
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View: Figures


Image of FIG. 1.
FIG. 1.

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).

Image of FIG. 2.
FIG. 2.

(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.

Image of FIG. 3.
FIG. 3.

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.

Image of FIG. 4.
FIG. 4.

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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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Anisotropic hot electron emission from fullerenes