The Spectrum of CuO: Low Lying Electronic States Observed by Laser Induced Fluorescence

Abstract

The spectrum of gas phase CuO in the red and near infra-red wavelength region is studied by the laser induced fluorescence technique. Three new low lying electronic states, CUE, rZni and 6'E, with the approximate To values CUC 15 424 cm-' y2 nl,* 15 470 cm-' y2n3,z 15 166 cm-' 6 2 r 12 986 cm-I are reported. The multiplicity of the CUE is uncertain. It is tentatively considered to be a quartet. The vibrational constants of the 6' C state are we -661 cm-' and W G e -5.7 cm-'. Earlier results on the spectrum of CuO are reviewed. Intensity anomalies, originating from interference between groups of states, are discussed.

Theoretical spectroscopy of copper monoxide

“…Such assignment seemed to be confirmed by calculations by Madhavan and Newton [33], yielding 12E -at T~ = 14 100cm i. On the other hand, Appelblad et al [18] determined relative intensities for the transition from several states to the ground state. While the A2E ---~ X21-I transition is known to be the most intense in the molecule, the intensity of the ~2E--* X2I-I transition amounted to less than 1% of that of the former transition.…”

“…After the ground state was correctly assigned as a 21-I state [8], a large number of further experimental studies were published [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26]. They yielded insight into parts of a very complicated spectrum, due to a large number of close-lying electronic states.…”

On-line spectroscopic and spectrometric methods for the determination of metal species in industrial processes☆

“…In contrast, the alkali chlorides and hydroxides are dissociative and so cannot be detected by molecular spectroscopy. Spectra of a number of heavy metal molecules of interest in combustion have been recorded in the IR, visible and UV including AuO [166], CuO [167], CuS [168], PbCl [169], PbO [170], FeO [171], FeCl [172], VO [173], VCl [174], NiCl [175,176]; NiCl 2 [177], PtO [178]. However, even though metal species are in the form of small molecules, many of them show a large proliferation of energy levels, leading to highly complex spectra.…”

Optical modes in nanoscale one-dimensional spin chains

“…The numeric value for this sole phonon mode is interesting just because it reflects the accuracy in the estimation of force constant for the Cu-O string. The obtained results may be confronted with the photoemission data for the gas phase CuO but unfortunately the IR and far IR emission data exist only for a narrow band of photon energy from 1.5 to 2.0 eV [9]. The calculated DOS for the Cu-O single unit (after optimization of geometry) is shown in Fig.…”