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HgIn photoassociation, bound-bound transitions, and excimer emission
No full textLaser excitation of In atoms at the 6 2S1/2–5 2P1/2 atomic resonance transition wavelength of 410.3 nm in
the presence of Hg vapor produces several types of emission features: HgIn excimer satellites on the red wings
of the In resonance fluorescence transitions at 410.3 and 451.1 nm, bound-bound HgIn molecular fluorescence
at 499 and 522 nm resulting from photoassociation of In(6 2S1/2) with Hg(6 1S0), and UV atomic fluorescence
from the In(5 2D) states that lie at energies above the In(6 2S1/2–5 2P1/2) excitation. These various spectral
features are interpreted in terms of a proposed HgIn potential-energy level diagram with additional information
from measured excited-state lifetimes and the power dependence of the laser excitation at 410.3 and 522 nm.
Direct excitation of the 499 and 522 nm HgIn bound-bound transitions also produces emission at 410.3 and
451.1 nm resulting from collisional dissociation of the excited HgIn states
Light-induced atom desorption
No full textIn the present paper we report experimental evidence of a new effect, observed for the first time by Gozzini et al. on sodium vapour, in which an important rubidium vapour density increase (larger than one order of magnitude) is observed when silane-coated cells are shined by non-resonant and weak light. The effect is due to non-thermal light-induced atom desorption. A preliminary analysis of its dependence on the light power density and on the wavelength has been carried out. © 1994 IOP Publishing Ltd
Radiation trapping and vapor density of In confined in quartz cells
No full textWe have measured, in the 700-950°C temperature range, the effective lifetime of the 6S1,2 excited level of indium vapor confined in quartz cells. The self trapping results much lower than expected suggest an effective vapor density lower than the one
calculated at the thermal equilibrium. A possible explanation of this large deviation has been found in the increasing adsorption
rate of indium at the cell walls. Partial fluorescence spectrum of the adsorbed atoms is reported
Nonthermal light-induced atom desorption: main features and dynamics
No full textThe study of the very complicated atom-surface interaction in presence of light had an increasing momentum during these last few years. A new field has been opened by a recent experiment made by Gozzini et al.,1 where a new and interesting effect, consisting in a huge sodium desorption when a silane coated cell is illuminated at room temperature, has been observed. Similar results, still in silane coated cells, have also been obtained by Meucci et al.2 with rubidium and cesium. The effect, shortly indicated hereafter as LIAD (light-induced atom desorption), is totally different from the other processes produced by very intense laser pulses, where the main effect produced by light is a thermal one
Energy-pooling ionization and electron-ion recombination measurements in indium
No full textThe formation of electrons and ions in the collision between two indium atoms excited to the 6S1/2 level is reported. The ionization cross sections and the recombination coefficient for the subsequent electron/ion recombination are measured
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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