TY - CPAPER AU - L. Hollberg AU - John Hall CY - Interlaken, Switzerland N1 - JILA Pub. 2729 PB - Springer-Verlag New York PP - Interlaken, Switzerland PY - 1983 SN - ISBN-13: 9783540129578 TI - Observation of Energy Level Shifts of Rydberg Atoms due to Thermal Fields ER -