Th Ar Banner [skip navigation] National Institute of Standards and Technology NIST Physical Measurement Laboratory NIST Physical Measurement Laboratory
previous   Main Menu   next  

 

Summary

We performed laboratory measurements using the NIST FTS to establish wavelengths for more than 2000 lines in the range 691-5804 nm in the spectrum of a commercial Th-Ar hollow cathode lamp. This line list serves as calibration reference data for the wavelength calibration of ESO's high resolution IR spectrograph CRIRES by means of a physical model of CRIRES which is included in the science data reduction pipeline.

Th-Ar hollow cathode lamps hold the promise of becoming a generally applicable source of standards for wavelength calibration in the near IR, providing a high density of sharp well-characterized emission lines with the ease and efficiency of operation of a commercial discharge lamp.