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Accurate absolute reference frequencies from 1511 to 1545 nm of the ν 1 + ν 3 band of C 2 12 H 2 determined with laser frequency comb interval measurements

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Abstract

Absolute frequency measurements, with uncertainties as low as 2kHz (1×1011), are presented for the ν1+ν3 band of C212H2 at 1.5μm (194198THz). The measurements were made using cavity-enhanced, diode-laser-based saturation spectroscopy. With one laser system stabilized to the P(16) line of C213H2 and a system stabilized to the line in C212H2 whose frequency was to be determined, a Cr:YAG laser-based frequency comb was employed to measure the frequency intervals. The systematic uncertainty is notably reduced relative to that of previous studies, and the region of measured lines has been extended. Improved molecular constants are obtained.

© 2006 Optical Society of America

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