The laser-induced fluorescence spectroscopy of TiF in the ultraviolet region

Abstract

The laser-induced fluorescence (LIF) spectrum of jet-cooled 48TiF has been obtained in the wavelength region of 245–270 nm for the first time. Six pairs of vibronic bands were observed and assigned to two new transitions [37.8] 4Φ-X 4Φ and 4Δ-X 4Φ. Rotational analysis was carried out for the ( ν′ = 0–3 to ν″ = 0) vibrational bands of the [37.8] 4Φ 3/2-X 4Φ 3/2 and [37.8] 4Φ 5/2-X 4Φ 5/2 subbands, and also, the ( ν′, 0) and ( ν′+1, 0) vibrational bands of the 4Δ 1/2-X 4Φ 3/2 and 4Δ 3/2-X 4Φ 5/2 subbands. The effective equilibrium molecular constants for the [37.8] 4Φ 3/2 and [37.8] 4Φ 3/2 upper states were determined. In addition, lifetime measurements were carried out for all of the observed bands under collision-free conditions. On the basis of the spectroscopic constants and lifetime measurements, the electronic transitions involved in the observed high-lying electronic states are discussed.