(a) The UV-Vis absorption spectrum of [bmim]FeCl4. (b) The magnetic field dependence of magnetization response of [bmim]FeCl4 at room temperature.
(a) Transient ellipticity changes in [bmim]FeCl4 with pump helicities of right-handed σ+ (hollow circles), left-handed σ- (solid circles) and linearly (squares) polarized at fixed fluence of 12 mJ/cm2, respectively. Inset shows the oscillation part on the time scale from 0.6 to 3.0 ps. (b) Pump fluence dependence of photoinduced Faraday ellipticity changes at zero delay time for σ+ (hollow circles) and σ- (solid circles) circularly polarized pump pulse, respectively.
The variation of the peak intensity of the Faraday ellipticity changes at zero time delay with the angle of the wave plate (ϕ). The solid curve is a fit to Eq. (2) . The dashed and dotted curves show the contributions from the IFE and OKE, respectively.
(a) The fast Fourier transform (FFT) of the oscillatory part of the transient Faraday ellipticity changes of [bmim]FeCl4. (b) Laser fluence dependence of the amplitude of the oscillation for the left-handed circularly polarized pump pulse. (c) Schematically shows the selection rule for the ISRS process which involves circularly polarized pump pulse on the three-energy-level systems.
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