Xenon excited state

X 10 W/cm, just where the resonance occurs. A second indication that the excited states are playing an important role in the ionization dynamics is that the overall dependence of the rate on intensity is very close to rather than / as one would expect from perturbation theory for non-resonant ionization. We note that all the xenon excited states are more than five photons above the ground state, so the weaker than expected intensity dependence is not simply attributable to resonances of that order. 

By addition of a dissociative thermal electron capturing gas such as CH2Brj, which quantitatively produces the atomic Br anion, the three body recombination process for an anion can be determined in isolation of any two-body mutual neutralization reactions. For irradiated xenon-CH2Br2 gas mixtures, the total emission at 282 nm was foxmd to consist of X-rays, xenon dimer fluorescence, and XeBr (B,C) exciplex fluorescence formed from both ionic recombination and xenon excited-state reaction [67]... 

A measurement of the electron temperature or distribution function is a worthwhile experiment we hope to undertake sometime in the future. In the interim, we have measured another media property that relates to electron density and temperature, and is a principle component of the rare gas excitation scheme. Time dependent density measurements of the lowest xenon excited states in XeQ lasers... 

By measuring a large number of density differences actual densities can be inferred. This has not been done yet for these measurements, but estimates of the upper Xe level densities suggest that the values of density difference are probably within roughly 30% of the actual lower level density. Densities of the two lowest xenon excited states are of order 3 x 10 and 1.7 x 10 per cm for canonical 0.16% HQ laser mixtures. For mixtures lean in HQ, the xenon excited state density "runs away" as the HQ bums out (see Fig. 6). Preliminary modelling efforts show that the steady state densities are about what is expected, but the magnitude and time dependence of the Xe run away are not as expected. 

The reaction path shows how Xe and Clj react with electrons initially to form Xe cations. These react with Clj or Cl- to give electronically excited-state molecules XeCl, which emit light to return to ground-state XeCI. The latter are not stable and immediately dissociate to give xenon and chlorine. In such gas lasers, translational motion of the excited-state XeCl gives rise to some Doppler shifting in the laser light, so the emission line is not as sharp as it is in solid-state lasers. 

Matrix Isolation Spectroscopy. Gaseous hydrazoic acid and xenon (1/200) were condensed on a Csl disk cooled to 28-35 K. Exposure of the mixture to 254-nm radiation led to the consumption of HN3 and the formation of new vibrational bands at 3131.8, 3120.6, and 3109.0 cm assigned to triplet NH. The use of xenon as the matrix host is crucial to the success of the experiment. The heavy atom host accelerated intersystem crossing in either the excited state of HN3 or NH, which led to good yields of... 

Fayt et al.248 report a new band of U02 2 close to 560 nm growing up at high oxygen pressure (say 110 atm.). It is absolutely excluded that the excited state is an unknown triplet, but it may correspond to electron transfer between distinct molecules249 such as the purple colour of condensed mixtures250 of the colourless xenon and yellow gas IrF6 (forming Xe"IrF in the excited state) and hence conceivably due to an excited state... 

Figure 14.12 Essentials of a ruby laser. A cylindrical rod of ruby is illuminated by a helical xenon flashlamp which pumps a significant fraction of the Cr + ions into the F excited states. Nonradiative relaxation to the metastable stale creates a population inversion which produces the red laser emission. The righi-luiiid mirror on the ruby rod is partly transmitting to allow output of the laser beam.

This procedure provides a model of the xenon atom which accounts only for the manifold of singly excited states based on the lowest ionic core, P3/2- For all rare gases, a second manifold of states converges to the next spin-orbit component of the ion, the Pi/2 state. For example, these two ionization limits in xenon are separated by 1.3 eV corresponding to different total angular momenta, J, of the 5p configuration. The lower ionization potential is 12.15 eV. We assume that multiphoton excitations into these two manifolds are very weakly coupled so they can be treated separately. This assumption is reasonable because once one of the electrons is excited outside a particular core configuration, transitions... 

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