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We demonstrate that the current laser technology used for field-freemolecular alignment via a cascade of Raman rotational transitions allows forobserving long-discussed non-linear quantum phenomena in the dynamics of theperiodically kicked rotor. This includes the scaling of the absorbed energynear the conditions of quantum resonance and Anderson-like localisation in theangular momentum. Based on these findings, we suggest a novel approach totunable selective rotational excitation and alignment in a molecular mixture,using trains of short laser pulses. We demonstrate the efficiency of thisapproach by applying it to a mixture of two nitrogen isotopologues (14N2 and15N2), and show that strong selectivity is possible even at room temperature.

Quantum resonance, Anderson localisation and selective manipulations in molecular mixtures by ultrashort laser pulses