The molecular beam electric resonance technique has been used to conduct a high precision examination of the hyperfine spectrum of the four isotopomers of RbCl. Coupling constants for the nuclear electric quadrupole interactions, the spin-rotation interactions, the tensor and scalar spin-spin interactions, and a rubidium nuclear octupole interaction, and their dependence on vibrational and rotational states have been determined. The dominant interaction, the rubidium nuclear electric quadrupole interaction, shows a small shift with substitution of the chlorine isotope.
A 70 microphone, [Formula: see text], microphone phased array was built for use in the harsh environment of rocket launches. The array was set up at NASA Wallops launch pad 0A during a static-test firing of Orbital Sciences’ Antares engines and again during the first launch of the Antares vehicle. It was placed 400 ft away from the pad and was hoisted on a scissor lift 40 ft above ground. The data sets provided unprecedented insight into rocket noise sources. The duct exit was found to be the primary source during the static-test firing; the large amount of water injected beneath the nozzle exit and inside the plume duct quenched all other sources. The maps of the noise sources during launch were found to be time dependent. As the engines came to full power and became louder, the primary source switched from the duct inlet to the duct exit. Further elevation of the vehicle caused spilling of the hot plume, resulting in a distributed noise map covering most of the pad. As the entire plume emerged from the duct, and the on-deck water system came to full power, the plume itself became the loudest noise source. These maps of the noise sources provide vital insight for optimization of sound suppression systems for future Antares launches.
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