LRS Spectral Resolution

The table below shows the performance of the two grisms as measured from the spectra of arc lamps.

G1 (300 l/mm) G2 (600 l/mm) e2 (holographic grating) G3 (now offline )

Dispersion 5 Å/pix 2 Å/pix 0.74 Å/pix 1.88 Å/pix

Range 4067 - 10700 Å 4280 - 7278 Å 4790 - 5850 Å 6250 - 9100 Å

Resolution
note slit size Wavelength (Å) Resolution (Å)
with 2" slit Wavelength (Å) Resolution (Å)
with 1" slit Wavelength (Å) Resolution (Å)
with 1" slit Wavelength (Å) Resolution (Å)
with 1" slit

4358 16.7 4358 4.4 4790 4.8 6400 4.1

5943 16.6 5085 4.5 5850 4.2 6800 4.2

7248 16.7 5852 4.7 7200 4.1

8299 16.6 6678 4.4 8000 4.3

8786 19.0 7245 4.4 8400 4.5

10123 22.7 - - 8800 5.3

NOTE: We have not commissioned the LRS_e2_1.0_I configuration but this would cover from 7100 A - 8650 A.

	G1 (300 l/mm)		G2 (600 l/mm)		e2 (holographic grating)		G3 (now offline )
Dispersion	5 Å/pix		2 Å/pix		0.74 Å/pix		1.88 Å/pix
Range	4067 - 10700 Å		4280 - 7278 Å		4790 - 5850 Å		6250 - 9100 Å
Resolution note slit size	Wavelength (Å)	Resolution (Å) with 2" slit	Wavelength (Å)	Resolution (Å) with 1" slit	Wavelength (Å)	Resolution (Å) with 1" slit	Wavelength (Å)	Resolution (Å) with 1" slit
	4358	16.7	4358	4.4	4790	4.8	6400	4.1
	5943	16.6	5085	4.5	5850	4.2	6800	4.2
	7248	16.7	5852	4.7			7200	4.1
	8299	16.6	6678	4.4			8000	4.3
	8786	19.0	7245	4.4			8400	4.5
	10123	22.7	-	-			8800	5.3