TIME-RESOLVED LUMINESCENCE OF EUROPIUM COMPLEXES IN BULK AND NANOSTUCTURED DIELECTRIC MEDIA

2003 ◽  
Author(s):  
E. P. PETROV ◽  
D. A. KSENZOV ◽  
T. A. PAVICH ◽  
M. I. SAMOILOVICH ◽  
A. V. GUR'YANOV
Keyword(s):  
Europium Complexes ◽  
Time Resolved ◽  
Dielectric Media

scholarly journals A Photoluminescence-Based Field Method for Detection of Traces of Explosives

2004 ◽  
Vol 4 ◽  
pp. 725-735 ◽  
Author(s):  
E. Roland Menzel ◽  
Laird W. Menzel ◽  
Jake R. Schwierking
Keyword(s):  
Visual Inspection ◽  
Field Method ◽  
Europium Complexes ◽  
Time Resolved ◽  
Europium Luminescence ◽  
Test Kit ◽  
Detection Mode ◽  
532 Nm ◽  
Sensitivity Gain

We report a photoluminescence-based field method for detecting traces of explosives. In its standard version, the method utilizes a commercially available color spot test kit for treating explosive traces on filter paper after swabbing. The colored products are fluorescent under illumination with a laser that operates on three C-size flashlight batteries and delivers light at 532 nm. In the fluorescence detection mode, by visual inspection, the typical sensitivity gain is a factor of 100. The method is applicable to a wide variety of explosives. In its time-resolved version, intended forin situwork, explosives are tagged with europium complexes. Instrumentation-wise, the time-resolved detection, again visual, can be accomplished in facile fashion. The europium luminescence excitation utilizes a laser operating at 355 nm. We demonstrate the feasibility of CdSe quantum dot sensitization of europium luminescence for time-resolved purposes. This would allow the use of the above 532 nm laser.

Experimental evidence for the influence of the excitation wavelength on the value of the equilibrium constant as determined by Time-Resolved Emission Spectroscopy (TRES)

2006 ◽  
Vol 94 (5) ◽  
Author(s):  
Isabelle Billard ◽  
Gilles Montavon ◽  
Sandrine Markai ◽  
Catherine Galindo
Keyword(s):  
Emission Spectroscopy ◽  
Emission Spectra ◽  
Chemical System ◽  
Excitation Wavelength ◽  
Physical Parameters ◽  
Antenna Effect ◽  
Europium Complexes ◽  
Time Resolved ◽  
Photochemical Process ◽  
Direct Excitation

SummaryIn the case of a rapid photochemical process, a new theoretical result relating time-resolved emission spectroscopy data to three physical parameters of the chemical system has been recently proposed. This previous work, based on a simulation study, is experimentally evidenced in the present paper, using europium/acetate as a model system. The comparison of the emission spectra obtained upon direct excitation of europium (394 nm) and by use of the “antenna effect” (266 nm) evidences the occurring of a back-dissociation of excited europium complexes to form solvated excited free europium ions.

Europium complexes investigations in natural waters by time-resolved laser-induced fluorescence

1999 ◽  
Vol 396 (2-3) ◽  
pp. 253-261 ◽  
Author(s):  
Christophe Moulin ◽  
Jiang Wei ◽  
Pierre Van Iseghem ◽  
Ivan Laszak ◽  
Gabriel Plancque ◽  
...  
Keyword(s):  
Natural Waters ◽  
Laser Induced Fluorescence ◽  
Europium Complexes ◽  
Time Resolved

scholarly journals Bright, Highly Water-Soluble Triazacyclononane Europium Complexes To Detect Ligand Binding with Time-Resolved FRET Microscopy

2014 ◽  
Vol 53 (40) ◽  
pp. 10718-10722 ◽  
Author(s):  
Martina Delbianco ◽  
Victoria Sadovnikova ◽  
Emmanuel Bourrier ◽  
Gérard Mathis ◽  
Laurent Lamarque ◽  
...  
Keyword(s):  
Ligand Binding ◽  
Water Soluble ◽  
Europium Complexes ◽  
Time Resolved

scholarly journals Bright, Highly Water-Soluble Triazacyclononane Europium Complexes To Detect Ligand Binding with Time-Resolved FRET Microscopy

2014 ◽  
Vol 126 (40) ◽  
pp. 10894-10898 ◽  
Author(s):  
Martina Delbianco ◽  
Victoria Sadovnikova ◽  
Emmanuel Bourrier ◽  
Gérard Mathis ◽  
Laurent Lamarque ◽  
...  
Keyword(s):  
Ligand Binding ◽  
Water Soluble ◽  
Europium Complexes ◽  
Time Resolved

Liposome biodistribution by time resolved fluorimetry of lipophilic europium complexes

2005 ◽  
Vol 35 (2) ◽  
pp. 155-161 ◽  
Author(s):  
Nathalie Mignet ◽  
Quentin le Masne de Chermont ◽  
Tatiana Randrianarivelo ◽  
Johanne Seguin ◽  
Cyrille Richard ◽  
...  
Keyword(s):  
Europium Complexes ◽  
Time Resolved

Microtubule nucleation sequence studied by time-resolved x-ray scattering and electron microscopy

1983 ◽  
Vol 41 ◽  
pp. 766-767
Author(s):  
Eva-Maria Mandelkow ◽  
Eckhard Mandelkow ◽  
Joan Bordas
Keyword(s):  
Electron Microscopy ◽  
Dynamic Equilibrium ◽  
Time Resolved ◽  
X Ray ◽  
Additional Information ◽  
X Ray Scattering ◽  
Low Concentrations ◽  
Microtubule Growth ◽  
Ray Patterns ◽  
Ray Scattering

When a solution of microtubule protein is changed from non-polymerising to polymerising conditions (e.g. by temperature jump or mixing with GTP) there is a series of structural transitions preceding microtubule growth. These have been detected by time-resolved X-ray scattering using synchrotron radiation, and they may be classified into pre-nucleation and nucleation events. X-ray patterns are good indicators for the average behavior of the particles in solution, but they are difficult to interpret unless additional information on their structure is available. We therefore studied the assembly process by electron microscopy under conditions approaching those of the X-ray experiment. There are two difficulties in the EM approach: One is that the particles important for assembly are usually small and not very regular and therefore tend to be overlooked. Secondly EM specimens require low concentrations which favor disassembly of the particles one wants to observe since there is a dynamic equilibrium between polymers and subunits.

Electron Channeling Patterns

1977 ◽  
Vol 35 ◽  
pp. 12-13
Author(s):  
David C. Joy
Keyword(s):  
Electron Diffraction ◽  
Incidence Angle ◽  
Photographic Plate ◽  
Diffraction Effect ◽  
Angle Of Incidence ◽  
Bulk Single Crystal ◽  
Time Resolved ◽  
Electron Channeling ◽  
Spatially Resolved ◽  
Large Bulk

Electron channeling patterns (ECP) were first found by Coates (1967) while observing a large bulk, single crystal of silicon in a scanning electron microscope. The geometric pattern visible was shown to be produced as a result of the changes in the angle of incidence, between the beam and the specimen surface normal, which occur when the sample is examined at low magnification (Booker, Shaw, Whelan and Hirsch 1967).A conventional electron diffraction pattern consists of an angularly resolved intensity distribution in space which may be directly viewed on a fluorescent screen or recorded on a photographic plate. An ECP, on the other hand, is produced as the result of changes in the signal collected by a suitable electron detector as the incidence angle is varied. If an integrating detector is used, or if the beam traverses the surface at a fixed angle, then no channeling contrast will be observed. The ECP is thus a time resolved electron diffraction effect. It can therefore be related to spatially resolved diffraction phenomena by an application of the concepts of reciprocity (Cowley 1969).

Time-resolved high-resolution electron microscopy of structural stability in mgo clusters

1996 ◽  
Vol 54 ◽  
pp. 672-673
Author(s):  
T. Kizuka ◽  
N. Tanaka
Keyword(s):  
Electron Microscopy ◽  
High Resolution ◽  
Magnesium Oxide ◽  
Structural Stability ◽  
High Resolution Electron Microscopy ◽  
Video Tape ◽  
Solid State Physics ◽  
Time Resolved ◽  
Resolution Electron ◽  
Structural And Functional Properties

Structure and stability of atomic clusters have been studied by time-resolved high-resolution electron microscopy (TRHREM). Typical examples are observations of structural fluctuation in gold (Au) clusters supported on silicon oxide films, graphtized carbon films and magnesium oxide (MgO) films. All the observations have been performed on the clusters consisted of single metal element. Structural stability of ceramics clusters, such as metal-oxide, metal-nitride and metal-carbide clusters, has not been observed by TRHREM although the clusters show anomalous structural and functional properties concerning to solid state physics and materials science.In the present study, the behavior of ceramic, magnesium oxide (MgO) clusters is for the first time observed by TRHREM at 1/60 s time resolution and at atomic resolution down to 0.2 nm.MgO and gold were subsequently deposited on sodium chloride (001) substrates. The specimens, single crystalline MgO films on which Au particles were dispersed were separated in distilled water and observed by using a 200-kV high-resolution electron microscope (JEOL, JEM2010) equipped with a high sensitive TV camera and a video tape recorder system.

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