Abstract
The anisotropic orientation of the figure axis of pendular molecules is directly detected by polarization spectroscopy for ICl in the excited A 3Π1 state. A simple geometric model is outlined that simulates all spectral features over a wide range of experimental parameters, without any fitting procedure. The experimental technique, closely related to magnetic rotation spectroscopy, strongly favors low rotational states and is also selective for ΔJ within a rotational band. Spectra obtained using a gas cell at room temperature thereby become even sparser and simpler than can be attained by cooling molecules to a few kelvin. Moreover, it provides a technique for local measurement of electric or magnetic field strengths without mechanical devices.
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