Femtosecond NeNePo

L. Woste In stationary spectroscopy ZEKE certainly provides spectroscopic results at an impressive resolution. Using femtosecond pulses one can certainly not excite specific states as compared to ZEKE. The Fourier transform of the wavepacket evolution, however, exhibits also spectral resolution that easily reaches and even exceeds what we see in ZEKE spectra. For this reason, I do not see any disadvantage in using femtosecond NeNePo to probe states of a prepared molecule. 

As introduced in Chap. 1, a real-time NeNePo experiment on molecules or clusters starts with a photodetachment process followed by a photoionization step, each induced by an ultrashort laser pulse (see Fig.2.25). In Chap.5 the first, fascinating results measured with this technique are presented. The setup for this high-performance, femtosecond NeNePo charge reversal experiment is shown in Fig. 2.26. The special features of the laser system employed are then given, followed by a few fundamental details on generation, storage, and detection of the investigated particles. 

Generation, Storage, and Detection of Small Mass-Selected Silver Molecules and Clusters. In addition to the source of femtosecond pulses for the NeNePo investigations, negatively charged molecules and clusters (here silver) are necessary. The vacuum system is described in detail in [271]. 

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