Between 04:00 and 06:00 UT 20 July 1994 the H and A impact sites were
observed with the 10 micron heterodyne spectrometer on one of the
1.65 m telescopes of the Infrared Spatial Interferometer (ISI).
The aQ(2,2) and aQ(6,6) lines of 14NH3, at 10.737 and 10.784 microns respectively, were detected in emission. Antenna temperatures were about 1 K, corresponding to a brightness temperature of 185 K if the emission fills the 1.5 arcsec beam. The linewidths were close to 1 km/s (FWHM), similar to what we reported for the G-impact site earlier.
R. Boreiko, A. Betz, M. Bester, D. Hale