Difference between flight and ground

The difference between flight and ground synthesized sample, while not extreme for polymers formed jfrom miscible monomers, were significant. Whereas density differences were not readily apparent there were differences in permeability, although they were not always of the same extent between samples of the same chemical composition. In addition, some of the observed differences appeared to diminish considerably when the samples were exposed to normal treatment on earth such as annealing and grinding. 

It is quite likely that differences between flight and ground synthesis could be better demonstrated if the processes could be carried out much more slowly. The maximum duration of the experiment was eight days. In actuality each mission was designed so that the polymerizations were carried out faster than that with the polymerization being essentially complete in three to four days. We felt that we needed to be ready for a decision to shorten the mission. An experiment of longer duration, such as on-board space station would be extremely desirable. 

Upon visual inspection the homopolymers, formed from the miscible monomers, appear to be almost identical for both flight and ground samples. The density measurements revealed that any differences in density between... 

Resonantly enhanced n photon PES is often best described as the preparation of an excited neutral state by (n-l)-photons, followed by one-photon ionization. Thus, the PES will contain the same information as conventional one-photon PES except that the "initial state in the ionization event will be an electronic excited state rather than the ground state. Thus, the structure of the n-photon PES will reflect the difference between the excited neutral state and the states of the ion. The use of pulsed laser ionization creates the electrons at a well defined point in time and space. This makes it possible to design relatively simple spectrometers which measure the time-of-flight TOF for the electron to travel from the point of ionization to the detector. 

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