Precise Wavelengths for Fe, Ge and Pt in the Region Near 1935
Gillian Nave, Craig J. Sansonetti
Wavelengths of seven spectral lines of Fe I, Ge I and Pt I between 1932 and 1938 have been measured with uncertainties of less than 1x10-4 (5 parts in 108) using Fourier transform spectroscopy. These lines provide accurate standards for wavelength calibration of ArF excimer lasers operating at 193 nm. Previously reported wavelengths of Fe I, Cu II, and Ge I were evaluated for calibration of the absolute wavelength scale. Calibrations based on Fe I and Ge I were found to differ systematically be several parts in 108. A calibration based on Cu II was internally inconsistent at a level of 2 parts in 107 and was not used. Improved wavelengths for an additional 147 lines of Pt I and Pt II and 161 lines of Kr II in the region 1636 to 3151 are also reported.
Journal of the Optical Society of America B-Optical Physics