Wide Field Camera 3
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Posted by John Trauger (JPL) on June 24, 1999 at 16:48:32:

A summary of the WFPC2 spare grisms for the WFC3 strawman option 
list.  A grism-CCD separation of 450 mm was assumed for the 
dispersion estimate.

Red grism G800	
8.22 gvs/mm
Blocked to cover 5700 Angstroms and longward in first order 
Rays are undeviated at the blaze wavelength of 8850 Angstroms 
Dispersion ~ 40 Angstroms / CCD pixel

Blue grism G450	
16.2 gvs/mm
Blocked to cover 3600-6200 Angstroms in first order 
Rays are undeviated at the blaze wavelength of 5000 Angstroms 
Dispersion ~ 20 Angstroms / CCD pixel
	
UV grism G200
25 gvs/mm, ruled on a CaF2 substrate
Blocked shortward of 1650 Angstroms by SiO2 optics
Prism is cross dispersed to separate diffraction orders 
Dispersion ~ 13 Angstroms / CCD pixel in first order