Hyperfine Structure of Sodium Iodide

Abstract

A molecular‐beam electric resonance spectrometer has been used to study radio‐frequency transitions between the hyperfine‐structure sublevels of the J = 1J=1 state of 23Na127I. Transitions for the first four vibrational states have been observed in very weak electric field and near zero magnetic field. The intramolecular interaction constants obtained for the ground vibrational state are: (eqQ)sodium = − 4073.0(10)kHz;(eqQ)iodine = − 262140.7(10)kHz;csodium = 0.74(8)kHz;ciodine = 0.28(4)kHz;c3 = 0.17(8)kHz,c4 = − 027(8)kHz(eqQ)sodium=−4073.0(10)kHz;(eqQ)iodine=−262140.7(10)kHz;csodium=0.74(8)kHz;ciodine=0.28(4)kHz;c3=0.17(8)kHz,c4=−027(8)kHz. The numbers in parentheses are the uncertainties in units of the last quoted digit. Constants for the excited vibrational states have been determined with less precision because fewer transitions were observed.