Laser spectroscopy of YBr: rotational analysis of the C1Σ–X1Σ system

Abstract

The (0,0), (0,1), (0,2), (0,3), (1,2), (1,3), (1,4) and (2,4) bands of the C¹Σ–X ¹Σ transition of YBr, between 720 and 765 nm, have been studied using the technique of laser vaporization/reaction with supersonic cooling and laser induced fluorescence spectroscopy. Spectra of both Y⁷⁹Br and Y⁸¹Br isotopic molecules were observed and analysed. A merged least-squares fit of the measured line positions yield molecular constants for the = 0–2 levels of the C ¹Σ state and the = 0–4 of the X¹Σ state. The equilibrium bond length of the C¹Σ state has been determined to be 2.6087(2) Å.