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INFORMATION ABOUT THE AVAILABLE GRISMS


Grism Name Peak Wavelength Wavelength Range Resolution
() w1()     w2() ()
IFORS5 4000 3300 - 6300 8.8
IFOSC5 6000 5200 - 10300 9.2
IFORS1 4000 3300 - 5400 4.2
IFOSC7 5000 3800 - 6840 4.4
IFOSC8 6000 5800 - 8300 3.7
IFOSC13 5100 4800 - 5800 1.5 (3rd order)
Echelle
IFOSC9 a b 5000 3300 - 11500 1.4 (13th order)
Cross Dispersers
IFOSC10 4000 3300 - 6500 19.1
IFOSC11 5000 3700 - 7420 13.6
IFOSC12 6000 5200 - 10400 38.6

Grism IFOSC10, IFOSC11 & IFOSC12 are cross dispersers they are used with IFOSC9
Resolution is for a 1Arcsec slit (100micron on telescope image plane).

The Grism Efficiency are taken from the wavelength dependent transmition graphs available at the Danish 1.54-m Telescope DFOSC website:
http://www.ls.eso.org/lasilla/Telescopes/2p2T/D1p5M/misc/dfosc_grisms.html




2003 by Pavan Chakraborty
IUCAA, Pune