  We describe the SpArc science gateway for spectral data obtained during the
period from 1975 through 1995 at the Kitt Peak National Observatory using the
Fourier Transform Spectrometer (FTS) in operation at the Mayall 4-m telescope.
SpArc is hosted by Indiana University Bloomington and is available for public
access. The archive includes nearly 10,000 individual spectra of more than 800
different astronomical sources including stars, nebulae, galaxies, and Solar
System objects. We briefly describe the FTS instrument itself, and summarize
the conversion of the original interferograms into spectral data and the
process for recovering the data into FITS files. The architecture of the
archive is discussed, and the process for retrieving data from the archive is
introduced. Sample use cases showing typical FTS spectra are presented.
