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>Quenching, Lgr;hyphen;doublet mixing and fluorescence lifetimes of single excited NH(Athinsp;3Pgr;,vrsquo;=0,Nrsquo;,Jrsquo;,e/fthinsp;) states
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Quenching, Lgr;hyphen;doublet mixing and fluorescence lifetimes of single excited NH(Athinsp;3Pgr;,vrsquo;=0,Nrsquo;,Jrsquo;,e/fthinsp;) states
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机译：Quenching, Lgr;hyphen;doublet mixing and fluorescence lifetimes of single excited NH(Athinsp;3Pgr;,vrsquo;=0,Nrsquo;,Jrsquo;,e/fthinsp;) states
Eleven isolated states of NH(Athinsp;3Pgr;,vrsquo;=0) with selected Lgr;hyphen;doublet, spin and rotational properties were prepared by pulsed laser excitation of ground state NH(Xthinsp;3Sgr;minus;,vlsquo;=0,Jlsquo;) radicals. The average population in both Lgr;hyphen;doublet components was investigated by time resolved fluorescence. Kinetic data for the quenching and collisional Lgr;hyphen;doublet mixing, and fluorescence lifetimes were derived using a simple model. The fluorescence lifetimes forNrsquo;=3ndash;8 are found to be independent of rotational excitation in agreement with a recent calculation. The quenching rate constants for collisions with NH3support the mechanism of complex formation. The mixing of the Lgr;hyphen;doublets induced by collisions with NH3occurs by dipolar interaction. The kinetics of the mixing by He is in agreement with a recent quantum calculation of inelastic cross sections based onabinitiopotential surfaces. Several experiments were performed to characterize the system, particularly the NH(X) precursor.
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