Fl. Hong et al., Rotation dependence of electric quadrupole hyperfine interaction in the ground state of molecular iodine by high-resolution laser spectroscopy, J OPT SOC B, 18(3), 2001, pp. 379-387
Doppler-free high-resolution spectroscopy is applied to molecular iodine at
532 nm by Nd:YAG lasers. The main hyperfine components as well as the cros
sover lines are measured for R(56)32-0 and P(54)32-0 transitions by heterod
yne beating of two I-2-stabilized lasers. The measured hyperfine splittings
including both main and crossover lines are fitted to a four-term Hamilton
ian, which includes the electric quadrupole, spin-rotation, tensor spin-spi
n, and scalar spin-spin interactions, with an average deviation of similar
to1 kHz. Absolute values of the electric quadrupole hyperfine constants for
both the upper and the lower states are obtained. The rotation dependence
of the ground-state (v" = 0) electric quadrupole constant eQq" is found to
be eQq"(J) = -2452.556(2) - 0.000164(5)J(J + 1) - 0.000000005(2)J(2)(J + 1)
(2) MHz. (C) 2001 Optical Society of America.