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Al-Hadihe, A.M.
University of Technology, Baghdad (Iraq). School of Applied Sciences1987
University of Technology, Baghdad (Iraq). School of Applied Sciences1987
AbstractAbstract
[en] In this work, the spectral characteristics of seven well known dyes are presented. Hexacyanine, cryptocyanine, esculine coumarin 6, rhodamine 6 G, rhodaminelol, and cryslviolet were dissolved in different solvents and studied before and after the addition of some paramagnetic metals, copper, iron, and aluminium. Pyridine, dmso, chlorobenzene, and dichloroethane which have not been used before with these dyes were tried together with other common solvents like water, ethanol, and methanol. 18 tabs.; 60 figs.; 37 refs
Primary Subject
Source
1987; 116 p; Available from Information Center, Iraqi Atomic Energy Commission, Tuwaitha - Baghdad, P.O. Box 765, Iraq; Thesis (M.Sc.).
Record Type
Miscellaneous
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Thesis/Dissertation
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AbstractAbstract
No abstract available
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Journal Article
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Review of Scientific Instruments; v. 46(3); p. 281-283
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AbstractAbstract
[en] We report operation of microcavity lasers based on the gain only in the evanescent field region of whispering gallery modes. Two types of microcavities, microsphere and microcylinder, were used. First, a cylindrical microcavity of 125 micron diameter was surrounded by Rhodamine 6G dye molecules in ethanol solution of lower refractive index such that WGM's of the microcavity undergoes laser oscillation when the dye molecules in the evanescent field outside the cavity are excited by a second harmonic of a Nd:YAG laser. In the second experiment an ultrahigh Q microsphere was used for a cavity. The dye molecules outside the sphere, near the equator, of 102 μm diameter were excited, resulting in WGM lasing in the lowest radial mode order. The overall quality factor of the laser in this case was 3(2) X 109
Primary Subject
Source
KAERI, Taejon (Korea, Republic of); 353 p; 2000; p. 31-40; 8. symposium on laser spectroscopy; Taejon (Korea, Republic of); 3-4 Nov 2000; Available from KAERI, Taejon (KR); 28 refs., 7 figs.
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Miscellaneous
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Conference
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AbstractAbstract
[en] This paper is dedicated to the spectral and quantum-chemical studies of higher excited states of merocyanine derivatives of azaazulene and indandione. A particular attention is paid to the analysis of fluorescence excitation anisotropy spectra of the mentioned compounds. The long-wave shift by ≈ 50 nm of a deep clear minimum in the fluorescence excitation anisotropy spectrum due to an elongation of the polymethine dye chromophore is established. Such shift is close in a value to the bathochromic shift of the first minimum in the anisotropy spectrum of symmetric ionic polymethine dyes, in which this minimum corresponds to the second electronic transition. The parallel spectral study and quantum-chemical calculations allowed us to correctly interpret the fluorescence excitation anisotropy spectra of merocyanines and relate the first clear minimum with the seventh electronic transition. The last resembles the second electronic transition between delocalized molecular orbitals (MO) in polymethine dyes. (author)
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Journal Article
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Ukrayins'kij Fyizichnij Zhurnal (Kyiv); ISSN 0372-400X;
; v. 65(no.4); p. 319-324

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AbstractAbstract
[en] highly sensitive spectrophotometric method for the analysis of catecholamine drugs; L-dopa and methyldopa, is described. The analysis is based on the reaction of drug molecules with vanadium (V) which is reduced to vanadium (IV) and form complex with eriochrome cyanine R to give products having maximum absorbance (λmax) at 565 nm. Beer's law is obeyed in the range 0.028-0.84 and 0.099-0.996 μg mL-1 for L-dopa and methyldopa, respectively. The statistical analysis as well as comparison with reported methods demonstrated high precision and accuracy of the proposed method. The method was successfully applied in the analysis of pharmaceutical preparations. (author)
Primary Subject
Source
Available from http://www.scielo.br/pdf/qn/v34n3/02.pdf
Record Type
Journal Article
Journal
Quimica Nova On-Line; ISSN 1678-7064;
; v. 34(3); p. 373-376

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External URLExternal URL
Kalanoor, Basanth S.; Bisht, Prem B.; Annamalai, Senthilmurugan; Aidhen, Indrapal Singh, E-mail: bisht@iitm.ac.in, E-mail: isingh@iitm.ac.in2009
AbstractAbstract
[en] We report here the synthesis of a distyrylbenzene derivative with end substituent as Weinreb amide. This Weinreb amide-based distyrylbenzene (WADSB) gives indications of highly efficient laser dye as well as a nonlinear optical medium. The photophysical parameters of the dye are given here. The lasing spectra of the dye have been measured in a cuvette configuration. The third-order nonlinear susceptibility has been measured by laser-induced transient grating technique (LITG). A comparison with the existing standard molecules shows that it is a comparably an efficient lasing material as well as an efficient nonlinear optical material at the pump wavelength of 355 nm.
Primary Subject
Source
S0022-2313(09)00293-2; Available from http://dx.doi.org/10.1016/j.jlumin.2009.05.003; Copyright (c) 2009 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
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Journal Article
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AbstractAbstract
[en] A review on the development of ternary complexes in spectrophotometric determination of thorium in the past ten years and the application of color-developing agent is presented
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AbstractAbstract
No abstract available
Original Title
Patent
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Source
25 Feb 1975; 4 p; US PATENT DOCUMENT 3,868,590
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Patent
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AbstractAbstract
No abstract available
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Journal Article
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Mikrochimica Acta; (no.1); p. 30-35
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Yarborough, M.J.; Hobart, J.L.
Coherent Radiation, Palo Alto, Calif. (USA)1977
Coherent Radiation, Palo Alto, Calif. (USA)1977
AbstractAbstract
[en] The invention concerns a dye laser. This has an optical resonator consisting of two sections. One section with parallel entry rays and the tuning mechanism is equipped at one end with the reflector coupled to the output, which has 4% transparency, and at the other end there is a fully reflecting concave mirror. This mirror reflects the rays at an acute angle in the direction of a second concave mirror, with the focus between the two. The two concave mirrors limit the second section of the resonator. At the focus, a dye film or ray crosses the optical path below the Brewster angle to the optical axis. An argon-ion laser is used to stimulate the dye film optically, whose ray is focussed with a focussing lens to the above mentioned focus, where it passes through the dye film. This stimulating ray enters the optical resonator at an angle to the optical axis; the angle between the two should not exceed d/t rads, where d is the diameter of the stimulating ray when passing through the dye and t is the thickness of the dye film in the direction of the optical axis. The dye film is sprayed through the ray by a nozzle, where the dye can be changed, as in a revolver, according to the wave length range required. (ORU)
[de]
Die Erfindung betrifft einen Dauerstrich-Farbstofflaser. Dieser weist einen aus zwei Abschnitten bestehenden optischen Resonator auf. Der eine Abschnitt mit parallem Strahlengang und dem Abstimm-Mechanismus ist am einen Ende vom ausgangskoppelnden Reflektor mit 4% Durchlaessigkeit, am anderen Ende von einem voellig reflektierenden Hohlspiegel begrenzt; dieser Spiegel reflektiert die Strahlung unter spitzem Winkel in Richtung auf einen zweiten Hohlspiegel, zwischen denen sich der Brennpunkt befindet; beide Hohlspiegel begrenzen den zweiten Abschnitt des Resonators. Im Brennpunkt kreuzt ein Farbstoffilm oder -strahl den optischen Weg unter dem Brewsterschen Winkel gegen die optische Achse. Zur optischen Anregung des Farbstoffilms wird ein Argon-Ionen-Laser verwendet, dessen Strahl mit einer Fokussierlinse auf den genannten Brennpunkt fokussiert wird, wo er den Farbstoffilm durchstrahlt. Dieser Anregungsstrahl tritt schief hinsichtlich der optischen Achse in den optischen Resonator ein, der Winkel zwischen beiden soll d/t rad nicht ueberschreiten, wobei d der Durchmesser des Anregungsstrahls beim Durchtritt durch den Farbstoff und t die Dicke des Farbstoffilms in Richtung der optischen Achse sind. Der Farbstoffilm wird mittels Duese durch den Strahlengang gespritzt, wobei revolverartig die Farbstoffe je nach dem gewuenschten Wellenlaengenbereich gewechselt werden koennen. (ORU)Original Title
Dauerstrich-Farbstofflaser
Primary Subject
Source
10 Mar 1977; 10 p; DE PATENT DOCUMENT 2425173/B/; Also available from Dt. Patentamt, Muenchen (FRG); 9 figs.
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Patent
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