Events collected by the Collider Detector at Fermilab (CDF) with an energet
ic jet plus large missing transverse energy can be used to search for physi
cs beyond the standard model. We see no deviations from the expected backgr
ounds and set upper limits on the production of new processes. We consider
in addition the production of light gravitinos and set a limit at 95% confi
dence level on the breaking scale root F greater than or equal to 217 GeV,
which excludes gravitino masses smaller than 1.1 X 10(-5) eV/c(2).