Rotational and vibrational structure in the 288nm band system of the FeCl2 radical

The observation of hot bands in the 288nm system of the FeCl2 radical

“…The electronic transition of FeCl 2 at 288 nm has been assigned as X = 5-4, emanating from the lowest spin component of the 5 D g ground state [1]. In two recent publications, we reported vibrational parameters for FeCl 2 in its ground electronic state [2] and in the excited state [1].…”

“…In two recent publications, we reported vibrational parameters for FeCl 2 in its ground electronic state [2] and in the excited state [1]. The molecule was formed in a sample at low vibrational temperatures (<100 K) in a free-jet expansion, and no hot bands were observed in the excitation spectrum [1].…”

“…In two recent publications, we reported vibrational parameters for FeCl 2 in its ground electronic state [2] and in the excited state [1]. The molecule was formed in a sample at low vibrational temperatures (<100 K) in a free-jet expansion, and no hot bands were observed in the excitation spectrum [1]. The least-squares fits of the ground-state vibrational bands observed in dispersed emission measurements [2] were supplemented by measurements of some hot band features in an early study of the spectrum recorded at higher vibrational temperature by Ashworth and Brown [3].…”

“…The experimental setup is the same as that described in the previous publications [1,2], except that we have reintroduced the ''light shield'' [4] that was designed to prevent blackbody radiation from the heated nozzle swamping the photomultiplier tube. The light shield consists of a stainless steel disc mounted beyond the alumina nozzle.…”

“…2. The spectrum was calibrated against the accurately determined positions of the R-branch heads of bands recorded at rotational resolution [1]. As usual, the dye laser scanning system was found to be highly linear in wavelength.…”