Frequency metrology on the EF 1
نویسندگان
چکیده
←X 1 g + 0,0 two-photon transition near 202 nm. For this purpose, the fourth harmonic of an injection-seeded titanium:sapphire pulsed oscillator is employed in a Doppler-free REMPI-detection scheme on a molecular beam of hydrogen. A frequency comb laser is used to perform the absolute frequency calibration on the continuous-wave CW laser that injection-seeds the oscillator. Chirp-induced frequency differences between the output of the pulsed oscillator and the seeding light are monitored on-line, while possible systematic shifts related to the AC-Stark and Doppler effects are addressed in detail. The transition frequencies of the Q 0 to Q 2 lines in H2 and D2, and the Q 0 and Q 1 lines in HD are determined with an absolute accuracy at the 10−9 level.
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