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Sensitive spectral observations made in two frequency bands near 6.0 and 17.6GHz are described for Orion and W51. Using frequency switching we were able toachieve a dynamic range in excess of 10,000 without fitting sinusoidal orpolynomial baselines. This enabled us to detect lines as weak as T$_{A} ~1mK inthese strong continuum sources. Hydrogen recombination lines with $\Delta n$ ashigh as 25 have been detected in Orion. In the Orion data, where the lines arestronger, we have also detected a systematic shift in the line centerfrequencies proportional to linewidth that cannot be explained by normaloptical depth effects.

astrophysics and space science

Sensitive Observations of Radio Recombination Lines in Orion and W51:  The Data and Detection of Systematic Recombination Line Blueshifts  Proportional to Impact Broadening