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GMOS Gratings

GMOS-N and GMOS-S are available with all gratings 

The table lists the properties of the GMOS gratings based on laboratory measurements. The resolving power R is given at the blaze wavelength, and refers to the resolution achieved with a slit width of 0.5 arcsec.

The effective slit width of the IFU in the dispersion direction is 0.31arcsec, see the IFU page for details.

Efficiency curves based on laboratory data are available. Note that the quantum efficiency of the detectors is below 5 per cent for wavelengths longer than 1000 nm. 

None of the gratings are currently used in 2nd order.

GMOS Gratings
Grating Grating number*
 [North / South]
Ruling density
[lines/mm]
Blaze
wavelength
[nm]
R Simultaneous
coverage
[nm]
nm/pixel Efficiency
data
B1200 G5301 1200 463 3744 143 0.023 GMOS-N data
G5321 GMOS-S data
R831 G5302 831 757 4396 207 0.034 GMOS-N data
G5322 GMOS-S data
B600 G5303 600 461 1688 276 0.045 GMOS-N data
G5323 GMOS-S data
R600 G5304 600 926 3744 286 0.047 GMOS-N data
G5324 GMOS-S data
R400 G5305 400 764 1918 416 0.067 GMOS-N data
G5325 GMOS-S data
R150 G5306 150 717 631 1071 0.174 GMOS-N data
G5326 GMOS-S data

*The grating name is the concatenation of grating and grating number e.g. R831_G5302 for the Gemini North R831 grating.

 

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Last update: September 5, 2003: Phil Puxley 
Previous version: August 19, 2002, Inger Jørgensen