ABSOLUTE WAVELENGTH DETERMINATIONS IN MOLECULAR TELLURIUM - NEW REFERENCE LINES FOR PRECISION LASER SPECTROSCOPY

We have observed the spectrum of Te-130(2) in the range 4712-5020 angstrom by using Doppler-free frequency-modulation spectroscopy. The wave numbers of 32 selected lines have been measured interferometrically with an accuracy of 2.2 parts in 10(9). These measurements provide a well-distributed set of precise reference lines for this region. Good agreement is found with four lines that were previously measured in other laboratories for use as transfer standards in the spectroscopy of hydrogen, deuterium, positronium, and muonium.