EMISSION SPECTRA OF NiH SHOWING EXTENSIVE ELECTRONIC ENERGY TRANSFER BETWEEN EXCITED STATES

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Title: EMISSION SPECTRA OF NiH SHOWING EXTENSIVE ELECTRONIC ENERGY TRANSFER BETWEEN EXCITED STATES
Creators: Ross, A. J.; Vallon, Raphael; Crozet, P.; Richard, Cyril
Issue Date: 2007
Publisher: Ohio State University
Abstract: Fourier transform resolved laser induced fluorescence spectra have allowed us to investigate the low-lying electronic states of NiH arising from the Ni(3d$^{9}$ 4s$^{1}$) configuration. Although laser excitation with a single mode laser should promote the molecule (formed in a hollow cathode discharge running at 1 torr pressure, with 10\% H$_2$ in argon) to a unique excited state that should be readily identifiable from the work of Kadavathu and co-workers,} 448 (1991)} the resolved fluorescence spectra are unexpectedly complex. Efficient energy transfer occurs between excited electronic states, retaining only isotopic selectivity. Analysis of the spectra locates energy levels up to 8000 cm$^{-1}$ above v=0 in the electronic ground state (X $^{2}\Delta_{5/2}$), from all components of the $^{2}\Sigma$, $^{2}\Pi$ and $^{2}\Delta$ states forming the supermultiplet complex studied by Gray et al.} 7164 (1991)} Measurements have been made so far for $^{58}$NiH and $^{60}$NiH. To observe heavier isotopes of nickel, an intracavity fluorescence experiment is required. Signals are increased by a factor 25, but the signal/noise ratio in Fourier spectra is disappointing when compared with intracavity excitation results.} 1 (1990)}} 554 (2005)} Nevertheless, this work has allowed us almost to double the range of known energy levels below 10000 cm$^{-1}$ for NiH.
Description: Author Institution: Universite Lyon 1; CNRS; LASIM UMR 5579, 43 Bd du 11; novembre 1918, F-69622 Villeurbanne, France
URI: http://hdl.handle.net/1811/31512
Other Identifiers: 2007-TA-08
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