The infrared spectrum of C3O2

Abstract

The 3v*r,3&, and 4~5 hot bands of the ~4 fundamental of CaOe in the 1580 cm-1 region were analyzed from tunable diode laser spectra and the ground state to VP + 2~~7 band at 1644 cm-r from Fourier transform spectra (FTS). The molecular constants for all of the VP 1 +-0 bands as well as the intensity of the VP + 2& sum band relative to the VI fundamental were in agreement with the predictions of the model of Weber and Ford. FTS spectra at 0.05 cm-r resolution were obtained of the sum and difference bands of ~2 with ~7 in the 750-900 cm-r region. Sharp Q branches occur for each ~7 state in the sum bands, but only a number of R-branch bandheads and no recognizable Q branches in the difference bands. Assignments of the sum band Q branches through ~7 = 6 were made and molecular constants were determined for the ~2 + Y+ +-0 transition at 819.7 cm-*. The Y'I potential function in the vz = 1 state was found to have a 1.2 cm-* barrier with a minimum at (x = 4.9", where 20! is the angular deviation from linearity. The Q-branch positions predicted from the calculated energy levels fit those observed within several cm-r. I. INTRODUCTION Measurements with tunable diode lasers in the region of absorption by the v4 fundamental of GO2 between 1565 and 1600 cm-' were recently reported (1). Some six overlapping bands having Pand R-branch structures indicative of a linear molecule were analyzed. The v4 fundamental was identified as being centered at 1587.39 cm-'. The five other bands were labeled as "hot bands" involving the excited states of the vr bending mode: 114, 2~~1, and 2~~7. The extremely low frequency of the VT vibration, about 18-19 cm-', results in an appreciable population in many of the excited states of ~7. Our early attempts to identify series of lines for higher excited states of vr were fruitless. There were a multitude of weaker lines, but we could not recognize any complete Pand R-branch series. More recently, vibration-rotation energy levels for the vr mode have been given by Weber and Ford (2) assuming a simple model of C302 : rigid O-CC bonds fixed at 180" and an anharmonic potential for the VT vibration. The parameters in the model were fixed by three quantities determined from experiments: the rotational constant B in

Analysis of the P branch of the ν6 fundamental of carbon su☐ide

“…The appearance of the I+ band is qualitatively similar to the z+ and 2~~ Raman bands (5,6) as well as the v2 + V, infrared band (7,8). In each of these cases the ground state transition is the lowest lying Q branch and the "hot" bands are shifted to a higher frequency.…”

Atmospheric pressure plasma conversion of CO 2 to solid deposits

“…The XPS and Auger spectra of C 3 O 2 were measured and analyzed first time at the Uppsala University by the group of Nobel laureate Kai Siegbahn [2]. Infrared spectra were reported a few years later [3].…”

“…In [1] McTaggart reported on the dissociation of CO 2 into CO and atom oxygen and also on the dissociation of CO in low power microwave carbon monoxide plasma at the moderate pressure (1)(2)(3). Orange-red layers were built up on the walls of the discharge tube and the effluent gas contained gaseous CO, CO 2 and O 2 .…”

“…The XPS and Auger spectra of C 3 O 2 were measured and analyzed first time at the Uppsala University by the group of Nobel laureate Kai Siegbahn [2]. Infrared spectra were reported a few years later [3].In our previous experiments the CO 2 reduction was observed both for rf and pulsed dc atmospheric pressure plasmas for special regimes during the NO x conversion [4,5]. The plasma kinetics is controlled by plasma characteristics (influenced substantially by the plasma source and its design).…”