Key points are not available for this paper at this time.
Linear Stark shifts and allowed electric dipole transitions have been observed for the first time in the ground electronic and vibrational state of a conventionally nonpolar molecule. By means of molecular-beam techniques, the electric dipole moment of CH₄ in its ground vibronic state has been determined to have a magnitude of (5. 38 0. 10) 10^-6 D.
I. Ozier (Mon,) studied this question.