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The emission spectrum of HgI
Authors:Carl Salter  Patricia C Tellinghuisen  J Gail Ashmore  Joel Tellinghuisen
Abstract:The ultraviolet emission systems of HgI—CX, DX, F3X, GX, and HX—are photographed and analyzed using tesla-discharge sources containing isotopically pure 200Hg. The previous assignment for F3X is revised, the main change being a decrease by 3 units in the v″ numbering. Results for the other systems corroborate the existing interpretations, except that for CX there are prominent intensity gaps in the unresolved rotational structure of the bands, not reported previously for “natural” HgI spectra. These gaps are attributed to perturbations of the C state by high levels (v ≈ 90) of the B state. The data for these systems are combined with existing BX data for 200Hg127I and 200Hg129I and fitted simultaneously to yield optimal vibrational parameters for all states. In this analysis the X state is fitted to a mixed representation—a polynomial in ( ) for v ≤ 20 and a near-dissociation expansion for v ≥ 20, with Gv and its first derivative constrained to be continuous at v = 20. The revised estimate of e for X is 2800 ± 40 cm−1. The recommended vibrational parameters (cm−1) for v ≤ 20 are ωe = 125.41, ωexe = 1.009, ωeye = −0.0159.
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