Abstract
Pure rotational spectra of the X 2Π vibronic ground states of H 35Cl + and H 37Cl + molecular ions have been measured by far-infrared laser magnetic resonance (LMR). The spectrometer, which contains an intracavity transverse dc discharge, is described in some detail. The theoretical formalism used to analyze the LMR spectra of HF +, HCl +, and HBr + is presented. The constants B, q, h, b, eQq 0, eQq 2, g 1, and g R were determined from a least-squares regression analysis of the J = 7 2 ← 5 2 and J = 9 2 ← 7 2 transitions in H 35Cl + and H 37Cl +. Values obtained for the molecular parameters support a model of HCl + with the electron density strongly localized on chlorine and with hydrogen exhibiting a substantial positive charge.
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