Stark effect of BaCl2

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Abstract
Observation of the refocusing in an electric quadrupole state selector of a velocity‐selected supersonic BaCl2 beam has yielded directly a lower limit of 1.2 D on the molecular electric dipole moment and a lower limit to the degree of ionic character of the BaCl bond of about 28%. An upper limit of 135° on the BaCl2 bond angle is obtained with the additional assumption that the bond degree of ionic character is less than that of RbCl, 78%. Combined with the lower limit to the degree of ionic character of 28%, this angle sets a lower limit to the molecular dipole moment of 2.2 D. The refocusing spectrum is characterized by a sharp refocusing threshold.