THE ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 103:235-246, 1996 March AN INFRARED SPECTRAL ATLAS OF ARCTURUS FOR THE RANGE 10750-11500 cm^-1 (8690-9300 A) LLOYD WALLACE AND KENNETH HINKLE Kitt Peak National Observatory, National Optical Astronomy Observatories, 950 N. Cherry Avenue, P.O. Box 26732, Tucson, AZ 85726; wallace@noao.edu, hinkle@noao.edu ABSTRACT An atlas of Arcturus spectra is presented spanning the 8690-9300 A (10750-11500 cm^-1) region. The high-resolution (lambda/delta(lambda) ~ 56000) Fourier transform spectra have been divided by a transmission function for the Earth's atmosphere. The Arcturus spectral features have been identified. This spectral region spans a gap between two major atlases, and comparison of the atlases is undertaken. The influence of a grating spectrograph's instrumental profile on equivalent width as well as line depth is noted. Subject headings: infrared: stars -- line: identification -- stars: individual (Alpha Bootis)