Abstract: Rotational coherence spectroscopy (RCS) is a powerful time domain method for obtaining structural information on large isolated molecules and clusters. This chapter reviews various strategies and implementations for RCS. Time-resolved femtosecond degenerate four-wave mixing (fs DFWM) allows investigating large species without permanent dipole moment and chromophore and provides high precision data for molecules in the ground state. The chapter reports the first rotationally resolved spectra of formic (HCOOH) and acetic (CH 3 COOH) acid dimers. ...
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Topics: 
Molecular physics
Optics
Atomic physics