Wavelength measurements of three iodine lines between 780 nm and 795 nm

Abstract

The vacuum wavelengths of hyperfine components of three different rovibronic transitions of the B 0u+ - X 1Eg+ spectrum of molecular 127I2 in the near-infrared were determined with a relative standard uncertainty of δλ/λ = 1.3 × 10-10. The measurements were performed by interferometric wavelength comparison using as standards an iodine-stabilized He-Ne laser at 633 nm and a dye laser stabilized to the intercombination line of Ca at 657 nm. The vacuum wavelengths of hyperfine component a10 of the R(96) lines of both the (0-14) and (0-15) bands and the component a of the P(166) line of the (0-14) band were determined to be 781.488 441 03(10) nm, 793.527 910 44(10) nm and 790.109 812 76(10) nm, respectively.