Bobby Berg arrived at NIST as an NRC postdoc in 1983. In subsequent years, he and Mike Moldover developed a series of novel oscillators that were used to measure the subtle viscosity increase that occurs near liquid-liquid and liquid-vapor critical points. NASA sponsorship extended that program to microgravity, and Bobby was principal investigator for experiments that flew on Space Shuttle flights in 1997 and 2003.
During 1998-2012, Bobby worked in the Pressure & Vacuum Group, where he calibrated spinning rotor gauges and developed techniques to measure gas flow rates in the range from 0.01 to 1000 cm3 per minute. The improved techniques led to viscosity measurements of helium and other gases with uncertainties small enough to test quantum mechanical ab initio calculations of gas viscosity. He also developed apparatus and techniques to measure the vapor pressures of metal-organic compounds that are used as precursors by the semiconductor manufacturing industry.
Bobby's present work in the Ultraviolet Radiation Group supports measurements of the degradation of optical mirrors caused by photoresists intended for EUV lithography.