A sample sequestering system which allows access to a subspace in a
chamber encompassed generally enclosed space, for use in entering and
removing a sample when the subspace is opened to atmosphere. Sufficient
purge gas is flowed from within the generally enclosed space into the
subspace discourage atmospheric contaminates from entering into the
subspace. Contained within the generally enclosed space is a
spectrophotometer, ellipsometer or polarimeter or the like system which
operates at wavelengths, (eg. UV), which are adversely affected, (eg.
absorbed), by typical atmospheric contents.