On Symplectic Cobordisms

Abstract

The emission of positronium negative ions from Cs deposited W(100) surfaces has been studied. A dramatic change in the emission efficiency was observed upon coating a W(100) surface with Cs. The conversion efficiency (the fraction of incident slow positrons yielding the ions) of the W(100) target with a 2.2 × 10 14 atoms cm −2 Cs coverage, measured over a time interval of 3 × 10 3 s immediately after deposition, was found to be 1.25%, which is two orders of magnitude higher than that obtained for the clean, uncoated W(100) surface and 45 times greater than the highest efficiency reported thus far.

On the Spaces $O(4n)/\textit{Sp}$ and $\textit{Sp}(n)/O$, and the Bott Maps

“…)cO(4n) by the standard representation. The limit space 0(oo)/Sp=lim O(kri)/Sp is then homotopically equivalent to the 8th iterated loop space Q 8 (0(oo}/Sp), as observed in [11] by N. Ray. This equivalence is derived from the Bott periodicity, and indeed, there are homotopy equivalences…”

“…Using this periodicity one can define a periodic J2-spectrum of period 8, and hence a periodic cohomology, whose coefficient group is given by the table in [11], (2.1) (see also [8], Appendix II).…”