Dispersed fluorescence spectroscopy of jet-cooled FeCl2: A determination of ground-state vibrational parameters

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

“…Those studied so far include FeCl 2 [4,5], CoCl 2 [6], NiCl 2 [7], and CuCl 2 [8]. Our preliminary observations of the 288 nm system of FeCl 2 were reported in a recent communication [4].…”

“…However, one infrared study of a matrix-isolated sample [12] maintains that FeCl 2 is slightly non-linear. The current work and the results of our dispersed fluorescence measurements [5] remove this area of doubt.…”

“…Our preliminary observations of the 288 nm system of FeCl 2 were reported in a recent communication [4]. The ground state vibrational structure of this molecule, determined by dispersed fluorescence spectroscopy, is the subject of a companion paper [5]. The present paper is concerned with the vibrational and rotational analysis of the 288 nm system of FeCl 2 , recorded by laser excitation spectroscopy.…”

“…The difference in zero-point energies between the isotopomers due to the doubly degenerate bending vibration has been ignored in this calculation. Note also that the small reduction in m 1 and increase in m 3 due to the interaction of these two modes in Fe 35 Cl 37 Cl (they both have the same symmetry, r + , in the C 1v molecule) has not been included in this calculation as the shift is known to be small (approximately 0.1 cm À1 [5]). The observed and calculated All values are in cm À1 .…”

“…First a pulsed dye laser system was used to study the broadband, vibrationally resolved excitation spectrum. The same system was then used in conjunction with a monochromator to disperse the fluorescence from individual vibronic transitions (the results of the dispersed fluorescence experiments are reported and discussed in the companion paper [5]). Finally, spectra of five individual vibronic bands were recorded at rotational resolution using a continuous-wave ring dye laser system.…”