Resolving power:
(lambda / delta lambda)

Typical uses:
(...and limitations)

Minimum recommended wavelength is ~1.15um due to the same inter-order overlap issues as with the 32 l/mm grating (see details). (Outside the overlap regions this grating is usable at shorter wavelength but care must be taken to ensure contamination is not a problem). 

Wavelength coverage is about one third of that with the 32 l/mm grating and so several settings are required to cover each atmospheric window

Spectra obtained at example grating settings are shown below of an A-type star with central wavelength: 1.27um (5th order), 1.66um (4th order), 2.14um (3rd order), 3.79um (2nd order).

Cross-dispersion removes the inter-order contamination and provides simultaneous spectra over orders 3 through 8. With the higher resolution of the 110 l/mm grating, only parts of each atmospheric window can be obtained at one grating setting. The OT cross-dispersed tab can be used to see the delivered wavelength range in each order for a given central wavelength. 

The prism (SF57 glass) has excellent transmission across almost the whole wavelength range but attenuates slightly at the red end of the K-window. There is a roll-off in transmission shortwards of 1.2um due to the broadband blocking filter; this filter is due to be replaced in 2005A. (The ITC includes the prism and filter properties).