Detection of 10.5-MICRON Line Emission from the Planetary Nebula NGC 7027

Spectra of several planetary nebulae have been obtained, with a resolution of 0.3 , at 950 and 11t2 , correspondmg to the fine-structure transition frequencies from the ground states of S iv and Ar m, respectively. The S iv line has been detected in NGC 7027 at 951.5 . Detection of the Ar m line in NGC 7027 is also indicated though not certain. Upper limits for line intensities in other planetary nebulae are given, as well as contmuum intensities in these spectral regions.