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Article
Laser and electron beams physical analyses applied to the comparison between two silver tetradrachm greek coins
Physical analyses by laser ablation coupled to mass quadrupole spectrometry (LAMQS), energy dispersive X-ray fluorescence (EDX) induced by electron beam, scanning electron microscopy (SEM) and surface profilom...
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Article
Al2O3 plasma production during pulsed laser deposition
A Nd:YAG laser operating in second harmonic (532 nm), 3 ns pulse duration, 150 mJ pulse energy, and 10 Hz repetition rate, is employed to irradiate Al2O3 target placed in high vacuum. The produced plasma is inves...
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Article
Temperature and density spectroscopic measurements in different laser-generated plasmas
A pulsed Nd:Yag laser, at intensities of the order of 1010 W/cm2, is employed to irradiate different thick metallic targets (Ti, Fe, Ag, and Ni) placed in vacuum. The obtained non-equilibrium plasmas are investig...
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Article
Energy distributions of particles ejected from laser-generated pulsed plasmas
A study of laser ablation in vacuum of metallic elements (Al, Cu and Ta) at different boiling points is reported. A Nd:YAG laser radiation, 3 ns pulse duration and 109 W/cm2 intensity, produces non-isotropic emis...
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Article
Investigation of the novel charge transfer complex Cd-TCNQ
A novel metal salt of TCNQ (tetracyanoquinodimethane) has been synthesized via an electrochemical process using cadmium as donor. Thin films of the same material have been obtained by evaporating under high vacuu...
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Article
Electron spectroscopy on the charge transfer complex [(7-amino-2,4 dimethyl-1,8 naphthyridine) (TCNQ)] (TCNQ = 7,7’,8,8’-tetracyanoquinodimethane)
Reflection electron energy loss spectroscopy (REELS) and optical reflectivity measurements have been used to characterize in the valence energy region the dielectric behavior of 7-amino-2,4 dimethyl-1,8 naphth...
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Article
Analysis of the phosphorescence of thianthren crystals
The room temperature phosphorescence of crystalline thianthren in the 1.6–3.3 eV energy region has been measured using time delays going from 0.03 to 9.5 ms. The time dependence of the emission spectra which s...
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Article
Comments on the paper «Fluorescence decay of indole in water» by N. Periasamy and G. C. Joshi
Examples of multiexponential decay of indole are reported. Problems connected with the minimization procedure are also outlined.
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Article
Experimental evidence of a short-lived component in the fluorescent decay of the indole
In this paper we report measurements of fluorescence phase-shift and modulation data of pure indole over a wide range of modulation frequencies. Our results firstly show two decay times in several solutions, i...
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Article
Optical properties, structure and electronic energy levels of the organicN-methyl, 2,3 diphenyl, 5-methyl indole compound
The absorption properties of the new synthetized organicN-methyl, 2,3 diphenyl, 5-methyl indole compound have been studied. An X-ray diffraction analysis has been carried out in order to obtain the structural pro...
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Article
Fluorescence spectra and electronic-energy levels of the semiconductor 7, 7′, 8, 8′ tetracyanoquinodimethane (TCNQ)
The luminescence of solutions of TCNQ together with their absorption spectra have been measured and compared with the optical properties of powders, as deduced by diffuse reflectance spectroscopy. The experime...
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Article
Optical properties of the semiconductor 7, 7′, 8, 8′, tetracyanoquinodimethane (TCNQ)
The reflectivity and absorption spectra of 7, 7′, 8, 8′ tetracyanoquinodimethane thin films, in the visible and near-ultraviolet range, have been measured. Samples have been grown and characterized by means of...
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Chapter and Conference Paper
Infrared Spectra of B- And P-Doped a-Si:H Films
The absorption spectra of several phosphorous and boron doped a-Si:H films, grown by an evaporation technique, are reported. The change of Si-Hn stretching and wagging (or rocking) absorption bands is studied as ...
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Article
a-Si:H films: Influence of P- and B-do** on infra-red absorption bands
The infra-red spectra of P- and B-doped hydrogenated amorphous silicon films grown by means of an evaporation method have been measured. The SiH n stretching and wagging (or roc...
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Article
Disorder and optical characterization of evaporation deposited a-Si: H films
We have found, from optical transmission and photoconductivity measurements, that the width of the Urbach’s tail and the optical-band gap value depend on the amount of disorder present in the network of a-Si: H f...
