J. Phys. Colloques
Volume 50, Numéro C8, Novembre 198936th International Field Emission Symposium
|Page(s)||C8-47 - C8-52|
J. Phys. Colloques 50 (1989) C8-47-C8-52
SIMULATION OF CROSS-CORRELATION FUNCTIONS BY A SUSPECTED SOLITON MECHANISM OF ALKALI SUBMONOLAYER FIELD EMISSION NOISEC. KLEINT
Sektion Physik, Karl-Marx-Universität Leipzig, Linnéstrasse 5, DDR-7010 Leipzig, D.R.G.
Cross-correlation (CC) measurements of alkali metal submonolayers adsorbed on the field emission tip show partly very high 'signal velocities' and negative CC functions. These features of the field emission flicker noise can hardly be explained by surface diffusion - concentration fluctuations and therefore soliton or domain wall movements have been proposed as a possible explanation. By proper use of a well known analytical function which describes the soliton propagation the cross-correlation function CCF for a two collector arrangement is simulated. The influence of soliton shape and velocity parameters and of the probe distance is studied and the resulting CCFs are presented. Curves with increasing correlation from negative values at small delay times to the positive region are indeed obtainable which mimic very well experimental results. They are in fact an indication of possible soliton movements in adsorbed layers.