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7) It appears from previous measurements that this orientational axis is identical with the longitudinal axis of inertia, however, we have not proved this generalization rigorously.(8) We are indebted to the referees for their comments on this matter. (9) Similar relations were derived by Norden [Chem. Script., 1, 145 (1971)] for the interpretation of the linear dichroic spectra of certain triarylmethane dyes. (10) The "in-plane" transitions are those polarized in the best plane of the molecule (which includes the twofold symmetry axis) whereasthe "out-of-plane" transitions are those polarized out of this plane.

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A search has been made for the 1(10) <-- 1(11) transition of thioformaldehyde in interstellar clouds where formaldehyde is known to exist. Failure to detect this transition indicates that the ratio of thioformaldehyde abundance to that of formaldehyde is probably less than the abundance ratio of sulfur to oxygen.