High-Resolution Fourier Transform Emission Spectroscopy of the TiCl Radical in the 420-nm Region

Submillimeter-Wave Spectroscopy of TiCl in the Ground Electronic State

“…The cell was evacuated with a mechanical booster pump backed by an oil-free rotary pump. At the beginning, the search for the pure rotational spectra was guided by the effective molecular constants obtained from the FT emission work (9,10). If the ground state is really 4 r , then the lines of the = 3/2 component should be stronger than those of the other spin components.…”

“…The effective molecular constants thus obtained are listed in Table 5. The effective rotational constants of the four spin components show good agreement and great improvement over the previous values from electronic FT emission spectra (9,10). The effective rotational constants for four spin components are given in terms of the rotational and spin-orbit constants as (11)…”

“…Following the detection of the v = 0 state of Ti 35 Cl, the measurements were extended to the v = 0 level of Ti 37 Cl and the v = 1 level of Ti 35 Cl by using the molecular constants from the FT measurements (9,10). It turned out that the signals were strong enough to observe rotational transitions in the v = 2 level During the survey, several lines, which have a slightly different optimum reaction condition from that of TiCl, were also discovered.…”

“…They suggested that the ground state was 4 on the basis of both LFT and DFT calculations. LFT provided the excitation energies for the 4 (9,10) and suggest that the TiCl molecule has a relatively pure 4 ground state. There is, however, still no experimental proof of the identity of the ground state, because the experimental conclusions were derived only from emission spectra (9,10) and by analogy with TiF and TiH.…”

Perturbation analysis in the rovibronic transitions of 48Ti35Cl at 3μm

“…Ram and Bernath [1] were the first ones to identify the ground electronic state as being a 4 U, on the basis of Fourier transform infrared emission spectra of the 0-0 rovibronic transitions in the C 4 D-X 4 U, G 4 U-X 4 U, and G 4 U-C 4 D systems. This outstanding work has been shortly extended by other considerable experimental investigations in the infrared by Ram and Bernath [2], and in the visible by Imajo et al [3]. High accuracy rotational spectroscopy has been then performed by Maeda et al [4], confirming the identity of the ground state.…”