Rotational analysis of electronic bands of gaseous TaO
- 1 January 1967
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Transactions of the Faraday Society
- Vol. 63, 1835-1845
- https://doi.org/10.1039/tf9676301835
Abstract
The rotational analysis of a number of bands in the emission spectrum of the arc in air between Ta rods in the region 2740–9500 Å has been completed. In all, 19 different electronic states, or substates, have been characterized : perturbations indicate the presence of others. Comparison with the absorption spectrum of matrix isolated TaO shows that the ground state X1 of TaO has Ω= 3/2. X1 is the lower state of many of the emission bands. A second lower state X2 with Ω= 5/2 lies at 3505 cm–1 above X1. If case a is followed, the ground state of TaO is therefore 2Δ with constants (cm–1) as follows [graphic omitted] A few bands with ΔΛ or ΔΩ=±1 in this spectrum have upper and lower states numbered by integral, rather than half-integral, values of J. These bands do not appear in the Ta arc in nitrogen, and it is suggested that they arise from a transition in TaO+.Keywords
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