Gas phase high temperature photoelectron spectroscopy: an investigation of the transition metals scandium and vanadium |
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Authors: | JM Dyke BWJ Gravenor MP Hastings GD Josland A Morris |
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Institution: | Department of Chemistry, The University, Southampton, S09 5NH Great Britain |
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Abstract: | The He(I) photoelectron spectra of atomic scandium and vanadium have been recorded in the gas-phase. For scandium two bands associated with a (4s)?1 ionization and one band associated with a (3d)?1 ionization of the neutral atom have been observed. Measurement of their relative intensities allows the σ3d:σ4s photoionization cross-section ratio in atomic scandium to be estimated as 57.1 ± 9.0. In the atomic vanadium spectrum, six bands were seen. Four of these correspond to (3d)?1 and (4s)?1 ionizations of the ground state of the neutral atom, the V a4F state, whereas two bands correspond to (3d)?1 ionizations of an excited state, the V a6D state, which is approximately 2100 cm?1 above the ground state. Measurement of the intensities of bands arising from the V a4F state allows σ3d:σ4s to be estimated as 29.8 ± 2.5 for vanadium. Spectra of vanadium have been recorded with both single- and multi-detector photoelectron spectrometers. Comparison of the data acquisition rates obtained with both spectrometers demonstrates the advantage of using a multidetector instrument in high temperature photoelectron spectroscopy. |
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