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XeF* (C1/2) radiative lifetime measurement
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11.The notation of Dunning and Hay (Ref. 12) will be used in this paper to describe the lowest‐lying ionic state.
12.T. H. Dunning, Jr. and P. J. Hay, Appl. Phys. Lett. 28, 649 (1976).
13.Careful spectroscopic measurements of the spectrum (using a monochromator‐high‐speed‐film combination) revealed strong (351 nm) and extremely weak (260 nm) emission. In addition, the broad weak continuum at ∼450 nm was observed. However, no other emission bands between 250 and 650 nm could be detected. So, e‐beam excitation of results (assuming equal C‐ and D‐state radiative lifetimes; for KrF, see Ref. 12) primarily in the production of C‐state molecules and the population of the level by radiative cascade (possibly from the D state) is later shown to be small.
14.The center of the and transitions of the band He roughly at 351 nm [see J. Tellinghuisen, G. C. Tisone, J. M. Hoffman, and A. K. Hays (J. Chem. Phys. 64, 4796 (1976)]. However, for the pressures used in these experiments, the spectrum is only partially relaxed (cf. Ref. 8) and so the detection system also views radiative contributions from higher‐lying vibrational levels.
15.J. G. Eden and S. K. Searles, Appl. Phys. Lett. 29, 350 (1976).
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18.The time period following termination of the beam current pulse is here referred to as the “afterglow”.
19.Two‐body formation processes, other than Eq. (2), may be lumped under the rate constant
20.Efforts to obtain a strong lasing from (351 nm) using as the halogen donor have thus far been unsuccessful despite the weak absorption spectrum of in the near uv. This is apparently due to the simultaneous production of () and XeF () through reaction (2). That is , XeF, which is bound by (cf. Ref. 13), rather than appears to be a product of the reaction of with [see G. D. Sides and T. L. Tiernan (J. Chem. Phys. 65, 3392 (1976)]. We have, however, observed weak lasing on both the 351.1‐ and 353.1‐nm lines in gas mixtures.
21.Although, as expected, the 351‐nm fluorescence intensity scaled directly with pressure, the waveforms shown in Fig. 2 have been normalized to the peak intensity for each pressure ( arbitrary units).
22.It must be pointed out that due to scatter in the data, it is impossible to accurately determine A “worst case” calculation assumes that and and, therefore, or,
23.R. Burnham and N. W. Harris, J. Chem. Phys. (to be published).
24.J. E. Velazco and D. W. Setser, Chem. Phys. Lett. 25, 197 (1974).
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