Identification of hyperfine structure components of the iodine molecule at 640 nm wavelength

Abstract

The frequencies and the relative intensities of rotation-vibration transitions of 127I 2, 129I 2 and 127I 129I near the HeNe laser emission wavelength of 640 nm have been calculated. Interpolation formulas for the differences of the electric quadrupole constants Δe Qq and of the spin-rotation constants Δ C of 127I 2 are given. Most of the weak saturated-aborption lines, elsewhere published, have been identified as cross-over and forbidden lines of the transitions P(10)8-5 and R(16)8-5.