What spectroscopic resolution(s) are available?
The spectral resolution of an IFTS is determined by the maximum optical path difference at which the interferogram is measured, and hence is continuously variable. IFIRS can obtain pan-chromatic imagery (R ~ 1), broad-band photometry (R ~ 10), low resolution spectrophotometry (R ~ 100), diagnostic spectroscopy (R ~ 1000) and kinematics (R ~ 10,000). The optical path difference can be scanned from 0-0.5 cm, hence the maximum spectral resolution is 30 GHz (1 wavenumber). The spectral resolution is fixed in frequency, so the maximum resolution is 10,000 at 1 µm and 1000 at 10 µm.
