Wave Packet Propagation in Alkali Dimers

the A state was studied in a spectral region (A = 840nm) 

With a change of the excitation wavelength (A = 833.7 nm), the influence of the crossing h JJu state could be investigated. The highly mass-resolved detection allowed the isotope-selective and K2) exploration of 

Similar results were obtained for two isotopes of the heteronuclear NaK molecule excited to its electronic A state. By means of spectrogram technique, the pronounced revival structure of the induced wave packet propagation was nicely illustrated. Higher order fractional revivals could be observed for the first time for a molecular system. Strong half and quarter revivals were observed at = 75 ps and = 40 ps for the lighter isotope 

23Na39K. For the heavier but rare isotope Na K the respective times were and = 35 ps. Weak fractional revivals could be 

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