Abstract
Hyperfine structures of the R(122)35-0 and P(84)33-0 transitions of molecular iodine near 532 nm are observed at the red end of the tuning range of the frequency-doubled Nd:YAG laser. Frequency separations between the hyperfine components are measured by observing the heterodyne beat between two I 2-stabilized lasers. The measured hyperfine splittings are fit to a four-term Hamiltonian, which includes the electric quadrupole, spin-rotation, tensor spin–spin, and scalar spin–spin interactions, with an accuracy of about 660 Hz. A new empirical formula for the electric quadrupole constant as a function of the vibrational and rotational energies in the B state is proposed. The observed hyperfine transitions are good candidates for an optical frequency reference in the 532 nm region.
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