Abstract
The propagation of wave packets on the B state potential energy surfaces of Na3 and K3 is investigated in detail. For Na3 excited at 620 nm the choice of special laser pulse parameters enabled via two photon ionization the observation of a selective excitation of the symmetric stretch mode (ωs = 104 cm-1). This documents the possibility of femtosecond state preparation by variation of excitation pump pulse duration and fluence. In case of K3 an excited electronic state (B) between 750 nm and 830 nm has been predicted by theoretical calculations but was never found by continuous wave (cw) spectroscopic techniques. With femtosecond three photon ionization this state is now observed. Exciting the system at 820 nm the real-time spectrum shows ultrafast oscillation with a period of 500 fs. Fourier analysis reveals four frequencies (64:5, 80, 90, 129 cm-1) which can be assigned to different normal modes of the excited and ground state of K3.
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