IRMS is a near-diffraction-limited multislit near-infrared spectrometer and imager.
It will operate behind NFIRAOS, over the 0.8 - 2.5 um wavelength range. Closely modeled after the Keck
instrument MOSFIRE, IRMS will employ a cryogenic slit assembly with 46 individually-configurable
slits. The slits can be positioned within a 2 arcmin field. The detector scale is 60 mas/pixel
and the spectral resolution is about R = 5000 for a 160 mas slit width (lower with wider slits).
The imager covers a 2.27 arcmin diameter FOV with 60 mas sampling. IRMS will be an early-light
instrument on the TMT.