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Description
The process of High-Harmonic Generation (HHG) emits a sequence of short bursts of radiation, which are coherently driven by the generation laser, where emission events occur during each laser half cycle. Each of these short bursts is in the attosecond regime and their interference leads to the observation of odd harmonics. These attosecond pulse trains (APTs), unlike isolated pulses, are readily available in a HHG setup. The goal of this annual research project is the development and simulation of advanced molecular x-ray spectra, such as Transient redistribution of ultrafast electronic coherences in attosecond Raman signals (TRUECARS), employing such sequences of attosecond pulses as pump-probes. In the TRUECARS technique:
$
S(\omega , T) = 2\Im \left\{ \int _{-\infty} ^{+\infty} dt \, e^{i\omega(t-T)}\varepsilon _0 ^* (\omega) \varepsilon_1 (t-T) \langle \psi (t) | \hat{\alpha} | \psi(t) \rangle \right\} $
an hybrid pulse- a combination of a narrow-band (single attosecond, $\varepsilon _0$) and a broadband (femtosecond, $\varepsilon _1$) pulse- is normally used.
After the simulation on model systems, good molecular candidates will be identified to perform quantum chemistry calculations on.
