Topic
Excimer
About: Excimer is a research topic. Over the lifetime, 3725 publications have been published within this topic receiving 75104 citations.
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TL;DR: Electronic structure calculations confirm the orientation of transition dipoles of the excimers along the interparticle axis and demonstrate how slow refinement of the intermolecular geometry leads to a significant increase in the excimer absorption strength.
Abstract: Formation of benzene excimer following UV excitation of the neat liquid is monitored with femtosecond spectroscopy. A prompt rise component in excimer transient absorption, which contradicts the classical scenario of gradual reorientation and pairing of the excited monomers, is observed. Three-pulse experiments in which the population of evolving excimers is depleted by a secondary dump pulse demonstrate that the excimer absorption band is polarized along the interfragment axis. The experiments furthermore prove that the subsequent 4-fold increase in excimer absorption over ∼50 ps is primarily due to an increase in the transition dipole of pairs which are formed early on, and not to excited monomers forming excimers in a delayed fashion due to unfavorable initial geometry. Results are analyzed in light of recent studies of local structure in the liquid benzene combined with advanced electronic structure calculations. The prompt absorption rise is ascribed to excited states delocalized over nearby benzene ...
25 citations
TL;DR: In this paper, an excimer laser ablation atomic emission spectrometry (LA-AES) was used for the detection of 0.13 µg g−1 of potassium in solid glass without sample preparation.
Abstract: A rapid, direct, and sensitive method for the determination of potassium in solid glasses based on excimer laser ablation atomic emission spectrometry (LA-AES) has been developed. This technique allows the direct detection of 0.13 µg g–1 of potassium in solid glass without sample preparation. Results show that the excimer LA-AES system can provide a precision of ±10% or better, and a linear response up to at least 461 µg g–1.
25 citations
TL;DR: In this article, the radiative decay of the excimer state CsF + isoelectronic to XeF was observed and the failure to detect the corresponding transitions in CsCl + is discussed.
25 citations
TL;DR: In this article, a kinetic analysis of the main VUV emissions of the two gases allows a complete kinetic scheme of the transfer phenomena to be established, which leads directly or indirectly to the production of the 3P1 and 3P2 states of xenon which, through three-body heteronuclear collisions, are involved in the formation of the radiative Xe2* states responsible for the emission of the second continuum at 173 nm.
Abstract: For pt.I see ibid., vol.15, p.2935 (1982). Spectroscopic and kinetic study of ultraviolet emissions from argon-xenon mixtures brings to light very large energy transfers from argon and xenon. When small amounts of xenon (a few ppm) are added to argon, the argon continua disappear and simultaneously Xe resonance lines can be seen. At higher Xe concentrations (of the order of a few per cent), the spectra of mixtures are similar to those obtained in pure xenon. Kinetic analysis of the main VUV emissions of the two gases allows a complete kinetic scheme of the transfer phenomena to be established. Excited radiative xenon states are created from Ar2* molecules and atomic precursor states. The 1P1 state of xenon is excited by two-body collisions with the excimer Ar2*(3 Sigma u+) which is responsible for the second argon continuum (k=1.5*107 Torr-1 s-1). The transfer is also observed from the Ar*(3P1) state towards highly excited xenon levels (configuration 5f) (k=2.4*107 Torr-1 s-1). Both these paths lead, directly or indirectly, to the production of the 3P1 and 3P2 states of xenon which, through three-body heteronuclear collisions, are involved in the formation of the radiative Xe2* states responsible for the emission of the second continuum at 173 nm. The lifetime of this state, tau =106 ns, is not modified by the presence of argon.
25 citations
TL;DR: In this paper, a comparison of Rydberg and valence spectra is made, showing that Rydinger fluorescence is particularly sensitive to the nature of the local environment, and that all observed emission is vibrationally relaxed.
Abstract: The 1933 A ArF excimer laser has been used to excite NO 3sσ Rydberg fluorescence in solid rare gases. A comparison of Rydberg and valence spectra indicates that Rydberg fluorescence is particularly sensitive to the nature of the local environment. The data demonstrate the limits of a continuum host approximation in the small ’’bubble’’ model. All observed emission is vibrationally relaxed. The relaxation rates appear to be many orders of magnitude faster than observed for ground state diatomics with equivalent vibrational quanta.
25 citations