Abstract

Coherent transient signals such as echoes, free induction decay, nutation etc. are known to originate from coherent summation of individual signals from different members of ensemble with inhomogeneous distribution of resonant frequencies. Recently, coherent transients on single molecules have been observed [1]. Physical reason for these observations is the jumps of a selected molecule within a distribution of possible resonant transition frequencies which are sampled sequentially during a long time of experiment by applying the exciting pulses repeatedly. Therefore, instead of conventional ensemble averaging in bulk-type measurements, in the latter case the temporal averaging takes place over many individual transient experiments on a single molecule.

© 1998 IEEE