Steady-State and Dynamic Fluorescence Measurements of a Perylene-Labeled Triblock Copolymer:  Evidence for Ground-State Dye Aggregate Formation

1999 ◽  
Vol 32 (15) ◽  
pp. 4895-4904 ◽  
Author(s):  
Matthew Moffitt ◽  
J. P. S. Farinha ◽  
M. A. Winnik ◽  
Ulrike Rohr ◽  
Klaus Müllen
Keyword(s):  
Steady State ◽  
Ground State ◽  
Triblock Copolymer ◽  
Aggregate Formation ◽  
Fluorescence Measurements ◽  
Dynamic Fluorescence

scholarly journals Calculating the Energy Spectrum of Complex Low-Dimensional Heterostructures in the Electric Field

2013 ◽  
Vol 2013 ◽  
pp. 1-7
Author(s):  
Svetlana N. Khonina ◽  
Sergey G. Volotovsky ◽  
Sergey I. Kharitonov ◽  
Nikolay L. Kazanskiy
Keyword(s):  
Steady State ◽  
Electric Field ◽  
Ground State ◽  
State Energy ◽  
Airy Functions ◽  
Piecewise Constant ◽  
Matrix Rank ◽  
The Matrix ◽  
Constant Potential ◽  
Low Dimensional

An algorithm for solving the steady-state Schrödinger equation for a complex piecewise-constant potential in the presence of theE-field is developed and implemented. The algorithm is based on the consecutive matching of solutions given by the Airy functions at the band boundaries with the matrix rank increasing by no more than two orders, which enables the characteristic solution to be obtained in the convenient form for search of the roots. The algorithm developed allows valid solutions to be obtained for the electric field magnitudes larger than the ground-state energy level, that is, when the perturbation method is not suitable.

scholarly journals Fluorescent chemosensors for metal ions based on 3-(2-benzoxazol-5-yl)alanine skeleton

2010 ◽  
Vol 8 (3) ◽  
pp. 674-686 ◽  
Author(s):  
Magda Milewska ◽  
Katarzyna Guzow ◽  
Wiesław Wiczk
Keyword(s):  
Steady State ◽  
Fluorescence Spectroscopy ◽  
Metal Ions ◽  
Ground State ◽  
Transition Metal Ions ◽  
Fluorescent Chemosensors ◽  
Time Resolved Fluorescence ◽  
Absorption Bands ◽  
Time Resolved ◽  
Ratiometric Sensors

AbstractThe ability of new chelate ligands, benzoxazol-5-yl-alanine derivatives substituted in position 2 by heteroaromatic substituent, to form complexes with selected metal ions in acetonitrile are studied by means of absorption and steady-state and time-resolved fluorescence spectroscopy. Among the ligands studied, only azaaromatic derivatives form stable complexes with transition metal ions in the ground state. Their absorption bands are bathochromically shifted enabling to use those ligands as ratiometric sensors. The fluorescence of each ligand is quenched by metal ions, however, in the presence of Cd(II) and Zn(II) ions a new red shifted emission band is observed.

NANOSECOND RESOLUTION IN FINGERPRINT IMAGING USING OPTICAL TECHNIQUE

2005 ◽  
Vol 04 (04) ◽  
pp. 695-700 ◽  
Author(s):  
U. S. DINISH ◽  
Z. X. CHAO ◽  
L. K. SEAH ◽  
V. M. MURUKESHAN
Keyword(s):  
Steady State ◽  
Optical Technique ◽  
Time Resolved ◽  
Latent Fingerprint ◽  
Electrical Signals ◽  
Background Fluorescence ◽  
Fluorescence Measurements ◽  
Dynamic Methods ◽  
Resolution Imaging

The extension of fluorescence measurements of samples from steady state to dynamic methods offers the possibility to extract valuable information at the micro and nano level. Imaging of fluorescent samples with nanosecond resolution often imposes challenging problems, especially when dealing with very weak optical and electrical signals. In this context, this paper discusses the detection of latent fingerprint samples with nanosecond resolution. Imaging of fingerprint samples, which are deposited on strongly fluorescing substrates, is carried out by the subsequent suppression of the unwanted background fluorescence emissions using the time-resolved optical technique. "signature" characterisation of fingerprint samples treated with fluorescent magnetic powders is also carried out.

LIF Observation of Ground-State OH Radicals in DC Nozzle-to-Plane Positive Streamer Corona

2006 ◽  
Vol 9 (2) ◽  
Author(s):  
M. Kocik ◽  
J. Mizeraczyk ◽  
S. Kanazawa ◽  
T. Ohkubo
Keyword(s):  
Steady State ◽  
Corona Discharge ◽  
Ground State ◽  
Atmospheric Pressure ◽  
Electrode System ◽  
Oh Radicals ◽  
Two Dimensional ◽  
Electrode Gap ◽  
Streamer Corona ◽  
Positive Streamer

AbstractIn this study, the planar LIF detection of the hydroxyl (OH) radicals was performed in a nozzle-to-plane electrode system having an electrode gap of 30 mm during the steady-state positive streamer corona discharge at atmospheric pressure. For monitoring the ground-state OH radicals, OH transition at 282 nm was used. The two-dimensional OH distribution in the DC corona discharge in air/H

Influence of Rotational Relaxation on Tropospheric OH Laser Induced Fluorescence Measurements

1982 ◽  
Vol 37 (6) ◽  
pp. 559-563
Author(s):  
K.-H. Gericke ◽  
F. J. Comes
Keyword(s):  
Ground State ◽  
Laser Induced Fluorescence ◽  
Rotational Relaxation ◽  
Water Molecules ◽  
Spectroscopic Methods ◽  
Additional Contribution ◽  
Rotational States ◽  
Fluorescence Measurements ◽  
Fast Relaxation ◽  
Electronic Ground

Abstract Rotational relaxation of OH molecules in the 2II electronic ground state has been observed to occur in collisions with water molecules with gas kinetic probability. It causes an additional contribution to the already well known sources of interference when LIF is used to monitor tropospheric OH. As the laser generated OH is originally produced mostly in high rotational states, the fast relaxation phenomenon leads to a further population of OH in low rotational states. These states are used to monitor tropospheric OH by spectroscopic methods. The observed effect therefore increases the interference. A mathematical analysis is presented, revealing the effect of all relevant parameters.

Spectral and Photoprototropic Characteristics of 4-Aminobiphenyl in β-Cyclodextrin

2004 ◽  
Vol 69 (4) ◽  
pp. 748-758 ◽  
Author(s):  
Israel V. Muthu Vijayan Enoch ◽  
Meenakshisundaram Swaminathan
Keyword(s):  
Excited State ◽  
Steady State ◽  
Fluorescence Spectroscopy ◽  
Inclusion Complex ◽  
Ground State ◽  
Time Resolved Fluorescence ◽  
Neutral Form ◽  
Time Resolved ◽  
Time Resolved Spectroscopy

The photophysical and photoprototropic behaviour of 4-aminobiphenyl (4ABP) in aqueous β-cyclodextrin (β-CDx) solution has been investigated using steady-state and time-resolved fluorescence spectroscopy. Fluorescence of the neutral form of 4ABP is enhanced due to the formation of a 1:1 complex with β-CDx. The formation of this complex has been confirmed by time-resolved spectroscopy. In the presence of β-CDx, no change was observed in the ground state pKa value but the excited state pKa value changed. Based on its photophysical and photoprototropic characteristics in β-CDx, the structure of the 1:1 inclusion complex is proposed.

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