Change page style: 

GNIRS + GCAL Arc Lamp Identifications

The following table shows a summary of GCAL emission line plots for two lamps (Ar and Xe) at near IR wavelengths. The spectra all have the same integration time. Wavelengths are in vacuum. See also the general wavelength calibration page for more line lists etc.

In general, the Argon lamp will be sufficient for wavelength calibration in most GNIRS observing modes. However, for the long camera / 111 grating case (R=18,000 mode), you may need to take supplementary Xenon lamp observations at wavelengths where the Argon lines are sparse. Check the plots below to verify this.

Note: The wavelength range in each of the plots below is equivalent to the coverage delivered by the short camera / 111 grating mode (R=6000), and 3 times the spectral window of the long/111 mode. The Argon lamp is sufficient for all arc lamp calibrations when using the 32 l/mm grating.


Waveband Wavelength Range (microns) GCAL Arc Lamp Plots
J 1.046 - 1.143 Argon Xenon
J 1.142 - 1.246 Argon Xenon
J 1.242 - 1.379 Argon Xenon
H 1.471 - 1.598 Argon Xenon
H 1.592 - 1.728 Argon Xenon
H 1.723 - 1.813 Argon Xenon
K 1.962 - 2.078 Argon Xenon
K 2.070 - 2.242 Argon Xenon
K 2.233 - 2.399 Argon Xenon

The following image and plots contain spectra of the argon lamp and line identifications: first a spectral image with some line IDs for the complete cross-dispersed 32l/mm grating + short camera mode, and then separate plots for orders 3 through 8 of that mode .


Order Approx. Wavelength Range (microns) GCCAL Argon Lamp Image/Plots
3-8 0.8 - 2.5 jpg image
3 1.88 - 2.52 postscript plot
4 1.41 - 1.90 postscript plot
5 1.13 - 1.51 postscript plot
6 0.95 - 1.25 postscript plot
7 0.90 - 1.06 postscript plot
8 0.72 - 0.95 (signal very weak <  0.9) postscript plot
J 1.046 - 1.143 Argon Xenon J 1.142 - 1.246 Argon Xenon J 1.242 - 1.379 Argon Xenon H 1.471 - 1.598 Argon Xenon H 1.592 - 1.728 Argon Xenon H 1.723 - 1.813 Argon Xenon K 1.962 - 2.078 Argon Xenon K 2.070 - 2.242 Argon Xenon K 2.233 - 2.399 Argon Xenon

The following image and plots contain spectra of the argon lamp and line identifications: first a spectral image with some line IDs for the complete cross-dispersed 32l/mm grating + short camera mode, and then separate plots for orders 3 through 8 of that mode .


Order Approx. Wavelength Range (microns) GCCAL Argon Lamp Image/Plots
3-8 0.8 - 2.5 jpg image
3 1.88 - 2.52 postscript plot
4 1.41 - 1.90 postscript plot
5 1.13 - 1.51 postscript plot
6 0.95 - 1.25 postscript plot
7 0.90 - 1.06 postscript plot
8 0.72 - 0.95 (signal very weak <  0.9) postscript plot
[teaser] =>

The following table shows a summary of GCAL emission line plots for two lamps (Ar and Xe) at near IR wavelengths. The spectra all have the same integration time. Wavelengths are in vacuum. See also the general wavelength calibration page for more line lists etc.

[log] => added XD spectral image of argon lamp with IDs of bright lines. - TRG [format] => 3 [uid] => 10002 [name] => rmason [picture] => [data] => a:4:{s:6:"notify";i:1;s:6:"submit";s:18:"Create new account";s:7:"form_id";s:13:"user_register";s:14:"tinymce_status";s:5:"false";} [path] => sciops/instruments/gnirs/calibration/arc-lamp-ids [last_comment_timestamp] => 1193183814 [last_comment_name] => [comment_count] => 0 [taxonomy] => Array ( ) [files] => Array ( ) ) -->