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We report on a study of microstructure and its quasi-periodicities of threepulsars at 1.65 GHz with the S2 VLBI system at a resolution of 62.5 ns, by farthe highest for any such statistical study yet. For PSR B1929+10 we found inthe average cross-correlation function (CCF) broad microstructure with acharacteristic timescale of 95+-10 mcs and confirmed microstructure withcharacteristic timescales between 100 and 450 mcs for PSRs B0950+08 andB1133+16. On a finer scale PSRs B0950+08, B1133+16 (component II) and B1929+10show narrow microstructure with a characteristic timescale in the CCFs of ~10mcs, the shortest found in the average CCF or autocorrelation function (ACF)for any pulsar, apart perhaps for the Crab pulsar. Histograms of microstructurewidths are skewed heavily toward shorter timescales but display a sharp cutoff.The shortest micropulses have widths between 2 and 7 mcs. No nanopulses orunresolved pulse spikes were detected. Cross-power spectra of single pulsesshow a large range of complexity with single spectral features representingclassic quasi-periodicities and broad and overlapping features with essentiallyno periodicities at all. Significant differences were found for the twocomponents of PSR B1133+16 in every aspect of our statistical analysis ofmicropulses and their quasi-periodicities. Asymmetries in the magnetosphere andthe hollow cone of emission above the polar cap of the neutron star may beresponsible for these differences.Comment: 18 pages, 11 figures, 3 tables, A&A, 2001, accepte

Pulsar microstructure and its quasi-periodicities with the S2 VLBI system at a resolution of 62.5 nanoseconds