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Considerable interest is now focused on the detection of terrestrial massplanets around M dwarfs, and radial velocity surveys with high-resolutionspectrographs in the near infrared are expected to be able to discover suchplanets. We explore the possibility of using commercially available molecularabsorption gas cells as a wavelength reference standard for high-resolutionfiber-fed spectrographs in the near-infrared. We consider the relative meritsand disadvantages of using such cells compared to Thorium-Argon emission lampsand conclude that in the astronomical H band they are a viable method ofsimultaneous calibration, yielding an acceptable wavelength calibration errorfor most applications. Four well-characterized and commercially availablestandard gas cells of HCN, 12C$_2$H$_2$, 12CO, and 13CO can together span over120nm of the H band, making them suitable for use in astronomicalspectrographs. The use of isotopologues of these molecules can increase linedensities and wavelength coverage, extending their application to differentwavelength regions.

On The Use of Absorption Cells as a Wavelength Reference for Precision Radial Velocity Measurements in the Near Infrared