Abstract

The frequencies of three Doppler-free absorption lines of the  127I2 molecule in the vicinity of 730 nm have been measured interferometrically with reference to an iodine-stabilized 633-nm He–Ne laser. These frequencies are important as transfer standards for Doppler-free, two-photon spectroscopy of the 1S2S transitions in muonium, hydrogen, and deuterium (with the use of frequency tripling to generate the necessary 244-nm radiation). The a15 component of the R(26) 5–13 transition has recently been used as a reference line in a high-precision measurement of the muonium 1S2S frequency interval. Under the conditions reported, the frequency of this transition was found to be 409 253 981.70 (0.14) MHz, ∼680 MHz away from the muonium transition.

© 2000 Optical Society of America

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