Rotational analysis of ultraviolet systems of FeCl

Abstract

A rotational analysis of several 0-0 bands for the FeCl molecule obtained in emission from a microwave discharge and lying in the 3200-3800 AA spectral region leads to a reassignment of system I and II as 6 Phi -6 Delta and 6 Pi -6 Delta transitions respectively. Both systems involve a 6 Delta i state as common lower state, most probably the ground state of the molecule. Rotational constants are given. Line doublings in system I are interpreted as splitting effects in the Omega =1/2 components of the 6 Phi and 6 Delta states.