Cool Stars 14 - Submitted Abstract # 88 This version created on 05 October 2006 Development of a gas absorption cell for the near infrared Ansgar Gaedke, Hamburger Sternwarte Guenter Wiedemann, Hamburger Sternwarte We are developing a gas absorption cell for high-precision radial velocity measurements in the near infrared. The aim is to transfer the well approved iodine absorption cell method, known from the optical, towards the near infrared. With the stellar atmosphere code PHOENIX we have calculated synthetic spectra for targets of interest, such as cool giants, M dwarfs, brown dwarfs and planetary mass objects, in order to search for lines in the infrared bands. We have investigated different gas species with a suitable number of reference lines in the same spectral regions as the target lines. Furthermore we have estimated the conditions for keeping line broadening effects low and obtaining a high-precision wavelength calibration. This method of wavelength calibration is giving a precision of a few hundred meters in the H band. ----------------------------------