Abstract
The high-resolution spectrum of ZrCl has been investigated in emission in the region 3000–10 000 cm−1using a Fourier transform spectrometer. The bands were excited in a microwave discharge through a flowing mixture of ZrCl4and helium. New ZrCl bands observed in the interval 3600–4400 cm−1have been assigned to a newC4Δ–X4Φ electronic transition. Four bands withRheads at 4305.7, 4208.0, 4064.7, and 3897.4 cm−1have been assigned as the 0–0 bands of the4Δ1/2–4Φ3/2,4Δ3/2–4Φ5/2,4Δ5/2–4Φ7/2, and4Δ7/2–4Φ9/2subbands. A rotational analysis of the 0–0, 1–1, and 2–2 vibrational bands of the four subbands has been obtained and molecular constants have been extracted. Although there is no proof that the lower4Φ state is the ground state of ZrCl, we have labeled this transition asC4Δ–X4Φ, consistent with the corresponding near-infrared transition of TiCl (R. S. Ram and P. F. Bernath,J. Mol. Spectrosc.,in press).
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